Remove spaces from std string in C

Question

What is the preferred way to remove spaces from a string in C    I could loop through all the characters and build a new string  but is there a better way

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From gamedev  string erase std  remove if string begin    string end    std  isspace   string end

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Just for fun  as other answers are much better than this   include  lt boost hana functional partial hpp gt   include  lt iostream gt   include  lt range v3 range conversion hpp gt   include  lt range v3 view filter hpp gt  int main         using ranges  to      using ranges  views  filter      using boost  hana  partial      auto const amp  not space   partial std  not equal to lt  gt               auto const amp  to string   to lt std  string gt        std  string input    quot 2C F4 32 3C B9 DE quot       std  string output   input   filter not space    to string      assert output     quot 2CF4323CB9DE quot

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I m afraid it s the best solution that I can think of  But you can use reserve   to pre-allocate the minimum required memory in advance to speed up things a bit  You ll end up with a new string that will probably be shorter but that takes up the same amount of memory  but you ll avoid reallocations   EDIT  Depending on your situation  this may incur less overhead than jumbling characters around   You should try different approaches and see what is best for you  you might not have any performance issues at all

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I m afraid it s the best solution that I can think of  But you can use reserve   to pre-allocate the minimum required memory in advance to speed up things a bit  You ll end up with a new string that will probably be shorter but that takes up the same amount of memory  but you ll avoid reallocations   EDIT  Depending on your situation  this may incur less overhead than jumbling characters around   You should try different approaches and see what is best for you  you might not have any performance issues at all

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I m afraid it s the best solution that I can think of  But you can use reserve   to pre-allocate the minimum required memory in advance to speed up things a bit  You ll end up with a new string that will probably be shorter but that takes up the same amount of memory  but you ll avoid reallocations   EDIT  Depending on your situation  this may incur less overhead than jumbling characters around   You should try different approaches and see what is best for you  you might not have any performance issues at all

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string removeSpaces string word        string newWord      for  int i   0  i  lt  word length    i              if  word i                        newWord    word i                        return newWord      This code basically takes a string and iterates through every character in it  It then checks whether that string is a white space  if it isn t then the character is added to a new string

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include  lt algorithm gt     using namespace std      int main                              s erase  remove  s begin    s end           s end                                  Source   Reference taken from this forum

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std  string  iterator end pos   std  remove str begin    str end          str erase end pos  str end

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The best thing to do is to use the algorithm remove if and isspace   remove if str begin    str end    isspace     Now the algorithm itself can t change the container only modify the values   so it actually shuffles the values around and returns a pointer to where the end now should be  So we have to call string  erase to actually modify the length of the container   str erase remove if str begin    str end    isspace   str end       We should also note that remove if will make at most one copy of the data  Here is a sample implementation   template lt typename T  typename P gt  T remove if T beg  T end  P pred        T dest   beg      for  T itr   beg itr    end    itr          if   pred  itr                 dest       itr      return dest

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You can use this solution for removing a char    include  lt algorithm gt   include  lt string gt  using namespace std   str erase remove str begin    str end    char to remove   str end

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I used the below work around for long - not sure about its complexity   s erase std  unique s begin   s end      char s char f  return  f       s          s end      when you wanna remove character     and some for example -  use  s erase std  unique s begin   s end      char s char f  return   f       s         f   -   s   -       s end      likewise just increase the    if number of characters you wanna remove is not 1  but as mentioned by others the erase remove idiom also seems fine

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I created a function  that removes the white spaces from the either ends of string  Such as  quot   Hello World    quot   will be converted into  quot Hello world quot   This works similar to strip  lstrip and rstrip functions  which are frequently used in python  string strip string str        while  str str length   - 1                    str   str substr 0  str length   - 1             while  str 0                    str   str substr 1  str length   - 1             return str     string lstrip string str        while  str 0                    str   str substr 1  str length   - 1             return str     string rstrip string str        while  str str length   - 1                    str   str substr 0  str length   - 1             return str

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std  string  iterator end pos   std  remove str begin    str end          str erase end pos  str end

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From gamedev  string erase std  remove if string begin    string end    std  isspace   string end

User · Answer

You can use this solution for removing a char    include  lt algorithm gt   include  lt string gt  using namespace std   str erase remove str begin    str end    char to remove   str end

User · Answer

From gamedev  string erase std  remove if string begin    string end    std  isspace   string end

User · Answer

Can you use Boost String Algo  http   www boost org doc libs 1 35 0 doc html string algo usage html id1290573  erase all str

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If you want to do this with an easy macro  here s one    define REMOVE SPACES x  x erase std  remove x begin    x end          x end      This assumes you have done  include  lt string gt  of course   Call it like so   std  string sName     Example Name    REMOVE SPACES sName   printf   s  sName c str        requires  include  lt stdio h gt

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string str    2C F4 32 3C B9 DE     str erase remove str begin   str end        str end       cout  lt  lt  str  lt  lt  endl    output  2CF4323CB9DE

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std  string  iterator end pos   std  remove str begin    str end          str erase end pos  str end

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I created a function  that removes the white spaces from the either ends of string  Such as  quot   Hello World    quot   will be converted into  quot Hello world quot   This works similar to strip  lstrip and rstrip functions  which are frequently used in python  string strip string str        while  str str length   - 1                    str   str substr 0  str length   - 1             while  str 0                    str   str substr 1  str length   - 1             return str     string lstrip string str        while  str 0                    str   str substr 1  str length   - 1             return str     string rstrip string str        while  str str length   - 1                    str   str substr 0  str length   - 1             return str

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Hi  you can do something like that  This function deletes all spaces   string delSpaces string  amp str        str erase std  remove str begin    str end          str end        return str        I made another function  that deletes all unnecessary spaces   string delUnnecessary string  amp str        int size   str length        for int j   0  j lt  size  j                  for int i   0  i  lt  j  i                          if str i          amp  amp  str i 1                                        str erase str begin     i                             else if str 0                                       str erase str begin                               else if str i       0   amp  amp  str i-1                                       str erase str end   - 1                                     return str

User · Answer

Can you use Boost String Algo  http   www boost org doc libs 1 35 0 doc html string algo usage html id1290573  erase all str

User · Answer

You can use this solution for removing a char    include  lt algorithm gt   include  lt string gt  using namespace std   str erase remove str begin    str end    char to remove   str end

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string str    2C F4 32 3C B9 DE     str erase remove str begin   str end        str end       cout  lt  lt  str  lt  lt  endl    output  2CF4323CB9DE

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include  lt algorithm gt     using namespace std      int main                              s erase  remove  s begin    s end           s end                                  Source   Reference taken from this forum

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For trimming  use boost string algorithms    include  lt boost algorithm string hpp gt   using namespace std  using namespace boost           string str1   hello world      trim str1           str1     hello world

User · Answer

I created a function  that removes the white spaces from the either ends of string  Such as  quot   Hello World    quot   will be converted into  quot Hello world quot   This works similar to strip  lstrip and rstrip functions  which are frequently used in python  string strip string str        while  str str length   - 1                    str   str substr 0  str length   - 1             while  str 0                    str   str substr 1  str length   - 1             return str     string lstrip string str        while  str 0                    str   str substr 1  str length   - 1             return str     string rstrip string str        while  str str length   - 1                    str   str substr 0  str length   - 1             return str

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Hi  you can do something like that  This function deletes all spaces   string delSpaces string  amp str        str erase std  remove str begin    str end          str end        return str        I made another function  that deletes all unnecessary spaces   string delUnnecessary string  amp str        int size   str length        for int j   0  j lt  size  j                  for int i   0  i  lt  j  i                          if str i          amp  amp  str i 1                                        str erase str begin     i                             else if str 0                                       str erase str begin                               else if str i       0   amp  amp  str i-1                                       str erase str end   - 1                                     return str

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Just for fun  as other answers are much better than this   include  lt boost hana functional partial hpp gt   include  lt iostream gt   include  lt range v3 range conversion hpp gt   include  lt range v3 view filter hpp gt  int main         using ranges  to      using ranges  views  filter      using boost  hana  partial      auto const amp  not space   partial std  not equal to lt  gt               auto const amp  to string   to lt std  string gt        std  string input    quot 2C F4 32 3C B9 DE quot       std  string output   input   filter not space    to string      assert output     quot 2CF4323CB9DE quot

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In C  20 you can use free function std  erase  std  string str     Hello World      std  erase str          Full example    include lt string gt   include lt iostream gt   int main         std  string str     Hello World          std  erase str            std  cout  lt  lt       lt  lt  str  lt  lt          I print   so that it is obvious that space at the begining is also removed   note  this removes only the space  not every other possible character that may be considered whitespace  see https   en cppreference com w cpp string byte isspace

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If you want to do this with an easy macro  here s one    define REMOVE SPACES x  x erase std  remove x begin    x end          x end      This assumes you have done  include  lt string gt  of course   Call it like so   std  string sName     Example Name    REMOVE SPACES sName   printf   s  sName c str        requires  include  lt stdio h gt

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Just for fun  as other answers are much better than this   include  lt boost hana functional partial hpp gt   include  lt iostream gt   include  lt range v3 range conversion hpp gt   include  lt range v3 view filter hpp gt  int main         using ranges  to      using ranges  views  filter      using boost  hana  partial      auto const amp  not space   partial std  not equal to lt  gt               auto const amp  to string   to lt std  string gt        std  string input    quot 2C F4 32 3C B9 DE quot       std  string output   input   filter not space    to string      assert output     quot 2CF4323CB9DE quot

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string replaceinString std  string str  std  string tofind  std  string toreplace            size t position   0          for   position   str find tofind   position    std  string  npos  position   str find tofind position                              str replace position  1  toreplace                     return str       use it   string replace   replaceinString thisstring         20    string replace2   replaceinString thisstring        -    string replace3   replaceinString thisstring

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I m afraid it s the best solution that I can think of  But you can use reserve   to pre-allocate the minimum required memory in advance to speed up things a bit  You ll end up with a new string that will probably be shorter but that takes up the same amount of memory  but you ll avoid reallocations   EDIT  Depending on your situation  this may incur less overhead than jumbling characters around   You should try different approaches and see what is best for you  you might not have any performance issues at all

User · Answer

Can you use Boost String Algo  http   www boost org doc libs 1 35 0 doc html string algo usage html id1290573  erase all str

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string removespace string str            int m   str length        int i 0      while i lt m                while str i     32          str erase i 1           i

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I used the below work around for long - not sure about its complexity   s erase std  unique s begin   s end      char s char f  return  f       s          s end      when you wanna remove character     and some for example -  use  s erase std  unique s begin   s end      char s char f  return   f       s         f   -   s   -       s end      likewise just increase the    if number of characters you wanna remove is not 1  but as mentioned by others the erase remove idiom also seems fine

User · Answer

std  string  iterator end pos   std  remove str begin    str end          str erase end pos  str end

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The best thing to do is to use the algorithm remove if and isspace   remove if str begin    str end    isspace     Now the algorithm itself can t change the container only modify the values   so it actually shuffles the values around and returns a pointer to where the end now should be  So we have to call string  erase to actually modify the length of the container   str erase remove if str begin    str end    isspace   str end       We should also note that remove if will make at most one copy of the data  Here is a sample implementation   template lt typename T  typename P gt  T remove if T beg  T end  P pred        T dest   beg      for  T itr   beg itr    end    itr          if   pred  itr                 dest       itr      return dest

User · Answer

string removespace string str            int m   str length        int i 0      while i lt m                while str i     32          str erase i 1           i

User · Answer

In C  20 you can use free function std  erase  std  string str     Hello World      std  erase str          Full example    include lt string gt   include lt iostream gt   int main         std  string str     Hello World          std  erase str            std  cout  lt  lt       lt  lt  str  lt  lt          I print   so that it is obvious that space at the begining is also removed   note  this removes only the space  not every other possible character that may be considered whitespace  see https   en cppreference com w cpp string byte isspace

User · Answer

The best thing to do is to use the algorithm remove if and isspace   remove if str begin    str end    isspace     Now the algorithm itself can t change the container only modify the values   so it actually shuffles the values around and returns a pointer to where the end now should be  So we have to call string  erase to actually modify the length of the container   str erase remove if str begin    str end    isspace   str end       We should also note that remove if will make at most one copy of the data  Here is a sample implementation   template lt typename T  typename P gt  T remove if T beg  T end  P pred        T dest   beg      for  T itr   beg itr    end    itr          if   pred  itr                 dest       itr      return dest

User · Answer

Just for fun  as other answers are much better than this   include  lt boost hana functional partial hpp gt   include  lt iostream gt   include  lt range v3 range conversion hpp gt   include  lt range v3 view filter hpp gt  int main         using ranges  to      using ranges  views  filter      using boost  hana  partial      auto const amp  not space   partial std  not equal to lt  gt               auto const amp  to string   to lt std  string gt        std  string input    quot 2C F4 32 3C B9 DE quot       std  string output   input   filter not space    to string      assert output     quot 2CF4323CB9DE quot

User · Answer

The best thing to do is to use the algorithm remove if and isspace   remove if str begin    str end    isspace     Now the algorithm itself can t change the container only modify the values   so it actually shuffles the values around and returns a pointer to where the end now should be  So we have to call string  erase to actually modify the length of the container   str erase remove if str begin    str end    isspace   str end       We should also note that remove if will make at most one copy of the data  Here is a sample implementation   template lt typename T  typename P gt  T remove if T beg  T end  P pred        T dest   beg      for  T itr   beg itr    end    itr          if   pred  itr                 dest       itr      return dest

User · Answer

Can you use Boost String Algo  http   www boost org doc libs 1 35 0 doc html string algo usage html id1290573  erase all str

User · Answer

Removes all whitespace characters such as tabs and line breaks  C  11    string str      n AB cd  t efg v n   str   regex replace str regex    s

User · Answer

The best thing to do is to use the algorithm remove if and isspace   remove if str begin    str end    isspace     Now the algorithm itself can t change the container only modify the values   so it actually shuffles the values around and returns a pointer to where the end now should be  So we have to call string  erase to actually modify the length of the container   str erase remove if str begin    str end    isspace   str end       We should also note that remove if will make at most one copy of the data  Here is a sample implementation   template lt typename T  typename P gt  T remove if T beg  T end  P pred        T dest   beg      for  T itr   beg itr    end    itr          if   pred  itr                 dest       itr      return dest

User · Answer

string removespace string str            int m   str length        int i 0      while i lt m                while str i     32          str erase i 1           i

User · Answer

In C  20 you can use free function std  erase  std  string str     Hello World      std  erase str          Full example    include lt string gt   include lt iostream gt   int main         std  string str     Hello World          std  erase str            std  cout  lt  lt       lt  lt  str  lt  lt          I print   so that it is obvious that space at the begining is also removed   note  this removes only the space  not every other possible character that may be considered whitespace  see https   en cppreference com w cpp string byte isspace

User · Answer

The best thing to do is to use the algorithm remove if and isspace   remove if str begin    str end    isspace     Now the algorithm itself can t change the container only modify the values   so it actually shuffles the values around and returns a pointer to where the end now should be  So we have to call string  erase to actually modify the length of the container   str erase remove if str begin    str end    isspace   str end       We should also note that remove if will make at most one copy of the data  Here is a sample implementation   template lt typename T  typename P gt  T remove if T beg  T end  P pred        T dest   beg      for  T itr   beg itr    end    itr          if   pred  itr                 dest       itr      return dest

User · Answer

You can use this solution for removing a char    include  lt algorithm gt   include  lt string gt  using namespace std   str erase remove str begin    str end    char to remove   str end

User · Answer

Can you use Boost String Algo  http   www boost org doc libs 1 35 0 doc html string algo usage html id1290573  erase all str

User · Answer

I created a function  that removes the white spaces from the either ends of string  Such as  quot   Hello World    quot   will be converted into  quot Hello world quot   This works similar to strip  lstrip and rstrip functions  which are frequently used in python  string strip string str        while  str str length   - 1                    str   str substr 0  str length   - 1             while  str 0                    str   str substr 1  str length   - 1             return str     string lstrip string str        while  str 0                    str   str substr 1  str length   - 1             return str     string rstrip string str        while  str str length   - 1                    str   str substr 0  str length   - 1             return str

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string str    2C F4 32 3C B9 DE     str erase remove str begin   str end        str end       cout  lt  lt  str  lt  lt  endl    output  2CF4323CB9DE

User · Answer

For trimming  use boost string algorithms    include  lt boost algorithm string hpp gt   using namespace std  using namespace boost           string str1   hello world      trim str1           str1     hello world

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string removeSpaces string word        string newWord      for  int i   0  i  lt  word length    i              if  word i                        newWord    word i                        return newWord      This code basically takes a string and iterates through every character in it  It then checks whether that string is a white space  if it isn t then the character is added to a new string

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include  lt algorithm gt     using namespace std      int main                              s erase  remove  s begin    s end           s end                                  Source   Reference taken from this forum

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From gamedev  string erase std  remove if string begin    string end    std  isspace   string end

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From gamedev  string erase std  remove if string begin    string end    std  isspace   string end

User · Answer

string removeSpaces string word        string newWord      for  int i   0  i  lt  word length    i              if  word i                        newWord    word i                        return newWord      This code basically takes a string and iterates through every character in it  It then checks whether that string is a white space  if it isn t then the character is added to a new string

User · Answer

I used the below work around for long - not sure about its complexity   s erase std  unique s begin   s end      char s char f  return  f       s          s end      when you wanna remove character     and some for example -  use  s erase std  unique s begin   s end      char s char f  return   f       s         f   -   s   -       s end      likewise just increase the    if number of characters you wanna remove is not 1  but as mentioned by others the erase remove idiom also seems fine

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string replaceinString std  string str  std  string tofind  std  string toreplace            size t position   0          for   position   str find tofind   position    std  string  npos  position   str find tofind position                              str replace position  1  toreplace                     return str       use it   string replace   replaceinString thisstring         20    string replace2   replaceinString thisstring        -    string replace3   replaceinString thisstring

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Hi  you can do something like that  This function deletes all spaces   string delSpaces string  amp str        str erase std  remove str begin    str end          str end        return str        I made another function  that deletes all unnecessary spaces   string delUnnecessary string  amp str        int size   str length        for int j   0  j lt  size  j                  for int i   0  i  lt  j  i                          if str i          amp  amp  str i 1                                        str erase str begin     i                             else if str 0                                       str erase str begin                               else if str i       0   amp  amp  str i-1                                       str erase str end   - 1                                     return str

User · Answer

Hi  you can do something like that  This function deletes all spaces   string delSpaces string  amp str        str erase std  remove str begin    str end          str end        return str        I made another function  that deletes all unnecessary spaces   string delUnnecessary string  amp str        int size   str length        for int j   0  j lt  size  j                  for int i   0  i  lt  j  i                          if str i          amp  amp  str i 1                                        str erase str begin     i                             else if str 0                                       str erase str begin                               else if str i       0   amp  amp  str i-1                                       str erase str end   - 1                                     return str

User · Answer

Can you use Boost String Algo  http   www boost org doc libs 1 35 0 doc html string algo usage html id1290573  erase all str

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I m afraid it s the best solution that I can think of  But you can use reserve   to pre-allocate the minimum required memory in advance to speed up things a bit  You ll end up with a new string that will probably be shorter but that takes up the same amount of memory  but you ll avoid reallocations   EDIT  Depending on your situation  this may incur less overhead than jumbling characters around   You should try different approaches and see what is best for you  you might not have any performance issues at all

User · Answer

I m afraid it s the best solution that I can think of  But you can use reserve   to pre-allocate the minimum required memory in advance to speed up things a bit  You ll end up with a new string that will probably be shorter but that takes up the same amount of memory  but you ll avoid reallocations   EDIT  Depending on your situation  this may incur less overhead than jumbling characters around   You should try different approaches and see what is best for you  you might not have any performance issues at all

User · Answer

Removes all whitespace characters such as tabs and line breaks  C  11    string str      n AB cd  t efg v n   str   regex replace str regex    s

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From gamedev  string erase std  remove if string begin    string end    std  isspace   string end

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I m afraid it s the best solution that I can think of  But you can use reserve   to pre-allocate the minimum required memory in advance to speed up things a bit  You ll end up with a new string that will probably be shorter but that takes up the same amount of memory  but you ll avoid reallocations   EDIT  Depending on your situation  this may incur less overhead than jumbling characters around   You should try different approaches and see what is best for you  you might not have any performance issues at all

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std  string  iterator end pos   std  remove str begin    str end          str erase end pos  str end

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If you want to do this with an easy macro  here s one    define REMOVE SPACES x  x erase std  remove x begin    x end          x end      This assumes you have done  include  lt string gt  of course   Call it like so   std  string sName     Example Name    REMOVE SPACES sName   printf   s  sName c str        requires  include  lt stdio h gt

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std  string  iterator end pos   std  remove str begin    str end          str erase end pos  str end

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For trimming  use boost string algorithms    include  lt boost algorithm string hpp gt   using namespace std  using namespace boost           string str1   hello world      trim str1           str1     hello world

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Removes all whitespace characters such as tabs and line breaks  C  11    string str      n AB cd  t efg v n   str   regex replace str regex    s

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string replaceinString std  string str  std  string tofind  std  string toreplace            size t position   0          for   position   str find tofind   position    std  string  npos  position   str find tofind position                              str replace position  1  toreplace                     return str       use it   string replace   replaceinString thisstring         20    string replace2   replaceinString thisstring        -    string replace3   replaceinString thisstring

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I used the below work around for long - not sure about its complexity   s erase std  unique s begin   s end      char s char f  return  f       s          s end      when you wanna remove character     and some for example -  use  s erase std  unique s begin   s end      char s char f  return   f       s         f   -   s   -       s end      likewise just increase the    if number of characters you wanna remove is not 1  but as mentioned by others the erase remove idiom also seems fine

User · Answer

From gamedev  string erase std  remove if string begin    string end    std  isspace   string end

User · Answer

string removeSpaces string word        string newWord      for  int i   0  i  lt  word length    i              if  word i                        newWord    word i                        return newWord      This code basically takes a string and iterates through every character in it  It then checks whether that string is a white space  if it isn t then the character is added to a new string

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If you want to do this with an easy macro  here s one    define REMOVE SPACES x  x erase std  remove x begin    x end          x end      This assumes you have done  include  lt string gt  of course   Call it like so   std  string sName     Example Name    REMOVE SPACES sName   printf   s  sName c str        requires  include  lt stdio h gt

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For trimming  use boost string algorithms    include  lt boost algorithm string hpp gt   using namespace std  using namespace boost           string str1   hello world      trim str1           str1     hello world

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The best thing to do is to use the algorithm remove if and isspace   remove if str begin    str end    isspace     Now the algorithm itself can t change the container only modify the values   so it actually shuffles the values around and returns a pointer to where the end now should be  So we have to call string  erase to actually modify the length of the container   str erase remove if str begin    str end    isspace   str end       We should also note that remove if will make at most one copy of the data  Here is a sample implementation   template lt typename T  typename P gt  T remove if T beg  T end  P pred        T dest   beg      for  T itr   beg itr    end    itr          if   pred  itr                 dest       itr      return dest

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I m afraid it s the best solution that I can think of  But you can use reserve   to pre-allocate the minimum required memory in advance to speed up things a bit  You ll end up with a new string that will probably be shorter but that takes up the same amount of memory  but you ll avoid reallocations   EDIT  Depending on your situation  this may incur less overhead than jumbling characters around   You should try different approaches and see what is best for you  you might not have any performance issues at all

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std  string  iterator end pos   std  remove str begin    str end          str erase end pos  str end

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From gamedev  string erase std  remove if string begin    string end    std  isspace   string end

User · Answer

Removes all whitespace characters such as tabs and line breaks  C  11    string str      n AB cd  t efg v n   str   regex replace str regex    s

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std  string  iterator end pos   std  remove str begin    str end          str erase end pos  str end

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string str    2C F4 32 3C B9 DE     str erase remove str begin   str end        str end       cout  lt  lt  str  lt  lt  endl    output  2CF4323CB9DE

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Can you use Boost String Algo  http   www boost org doc libs 1 35 0 doc html string algo usage html id1290573  erase all str

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In C  20 you can use free function std  erase  std  string str     Hello World      std  erase str          Full example    include lt string gt   include lt iostream gt   int main         std  string str     Hello World          std  erase str            std  cout  lt  lt       lt  lt  str  lt  lt          I print   so that it is obvious that space at the begining is also removed   note  this removes only the space  not every other possible character that may be considered whitespace  see https   en cppreference com w cpp string byte isspace

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Can you use Boost String Algo  http   www boost org doc libs 1 35 0 doc html string algo usage html id1290573  erase all str

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include  lt algorithm gt     using namespace std      int main                              s erase  remove  s begin    s end           s end                                  Source   Reference taken from this forum

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string removespace string str            int m   str length        int i 0      while i lt m                while str i     32          str erase i 1           i

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The best thing to do is to use the algorithm remove if and isspace   remove if str begin    str end    isspace     Now the algorithm itself can t change the container only modify the values   so it actually shuffles the values around and returns a pointer to where the end now should be  So we have to call string  erase to actually modify the length of the container   str erase remove if str begin    str end    isspace   str end       We should also note that remove if will make at most one copy of the data  Here is a sample implementation   template lt typename T  typename P gt  T remove if T beg  T end  P pred        T dest   beg      for  T itr   beg itr    end    itr          if   pred  itr                 dest       itr      return dest

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string replaceinString std  string str  std  string tofind  std  string toreplace            size t position   0          for   position   str find tofind   position    std  string  npos  position   str find tofind position                              str replace position  1  toreplace                     return str       use it   string replace   replaceinString thisstring         20    string replace2   replaceinString thisstring        -    string replace3   replaceinString thisstring

[c++] Remove spaces from std::string in C++

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