How do I extract a substring from a string until the second space is encountered

Question

I have a string like this    o1 1232 5467 1232 5467 1232 5467 1232 5467 1232 5467 1232 5467   How do I extract only  o1 1232 5467    The number of characters to be extracted are not the same always  Hence  I want to only extract until the second space is encountered

User · Answer

I would recommend a regular expression for this since it handles cases that you might not have considered   var input    o1 1232 5467 1232 5467 1232 5467 1232 5467 1232 5467 1232 5467   var regex   new Regex                  var match   regex Match input   if  match Success        Console WriteLine string Format    0     match Groups 1  Value

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Get the position of the first space   int space1   theString IndexOf         The the position of the next space after that   int space2   theString IndexOf      space1   1     Get the part of the string up to the second space   string firstPart   theString Substring 0  space2     The above code put togehter into a one-liner   string firstPart   theString Substring 0  theString IndexOf      theString IndexOf        1

User · Answer

Just use String IndexOf twice as in        string str    My Test String        int index   str IndexOf            index   str IndexOf      index   1        string result   str Substring 0  index

User · Answer

A straightforward approach would be the following   string   tokens   str Split       string retVal   tokens 0          tokens 1

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I was thinking about this problem for my own code and even though I probably will end up using something simpler faster  here s another Linq solution that s similar to one that  Francisco added   I just like it because it reads the most like what you actually want to do   Take chars while the resulting substring has fewer than 2 spaces    string input    o1 1232 5467 1232 5467 1232 5467 1232 5467 1232 5467 1232 5467   var substring   input TakeWhile  c0  index    gt                                   input Substring 0  index   1  Count c   gt  c          lt  2   string result   new String substring ToArray

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You could try to find the indexOf  o1   first  Then extract it  After this  Split the string using the chars  1232 5467            string test    o1 1232 5467 1232 5467 1232 5467 1232 5467 1232 5467 1232 5467           string header   test Substring test IndexOf  o1      o1   Length           test   test Substring  o1   Length  test Length -  o1   Length           string   content   test Split

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Something like this   int i   str IndexOf       i   str IndexOf      i   1   return str Substring i

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string testString    o1 1232 5467 1232 5467             string secondItem   testString Split new char         3  1

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P   Just a note  I think that most of the algorithms here wont check if you have 2 or more spaces together  so it might get a space as the second word   I don t know if it the best way  but I had a little fun linqing it  P  the good thing is that it let you choose the number of spaces words you want to take           var text    a sdasdf ad  a           int numSpaces   2          var result   text TakeWhile c   gt                                if  c                           numSpaces--                   if  numSpaces  lt   0                      return false                   return true                          text   new string result ToArray       I also got  ho s answer and made it into a cycle so you could again use it for as many words as you want  P          string str    My Test String hello world           int numberOfSpaces   3          int index   str IndexOf                     while  --numberOfSpaces gt 0                        index   str IndexOf      index   1                      string result   str Substring 0  index

User · Answer

There are shorter ways of doing it like others have said  but you can also check each character until you encounter a second space yourself  then return the corresponding substring   static string Extract string str        bool end   false      int length   0       foreach  char c in str                if  c         amp  amp  end    false                        end   true                    else if  c         amp  amp  end    true                        break                     length               return str Substring 0  length

User · Answer

string   parts   myString Split        string whatIWant   parts 0         parts 1

User · Answer

Use a regex     Match m   Regex Match text                  if  m Success        do something with m Groups 1  Value

User · Answer

s Substring 0  s IndexOf      s IndexOf        1

[c#] How do I extract a substring from a string until the second space is encountered?

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