How to remove duplicate white spaces in string using Java

Question

How to remove duplicate white spaces  including tabs  newlines  spaces  etc     in a string using Java

User · Answer

If you want to get rid of all leading and trailing extraneous whitespace then you want to do something like this:

// \\A = Start of input boundary
// \\z = End of input boundary 
string = string.replaceAll("\\A\\s+(.*?)\\s+\\z", "$1");

Then you can remove the duplicates using the other strategies listed here:

string = string.replaceAll("\\s+"," ");

User · Answer

You can use the regex    s  1   and   replace it with  1   Java code   str   str replaceAll     s   1    1      If the input is  foo t tbar    you ll get  foo tbar   as outputBut if the input is  foo t bar  it will remain unchanged because it does not have any consecutive whitespace characters   If you treat all the whitespace characters space  vertical tab  horizontal tab  carriage return  form feed  new line  as space then you can use the following regex to replace any number of consecutive white space with a single space   str   str replaceAll    s           But if you want to replace two consecutive white space with a single space you should do   str   str replaceAll    s 2

User · Answer

hi the fastest  but not prettiest way  i found is  while  cleantext indexOf          -1    cleantext   StringUtils replace cleantext                this is running pretty fast on android in opposite to an regex

User · Answer

Try this - You have to import java util regex         Pattern pattern   Pattern compile    s         Matcher matcher   pattern matcher string       boolean check   matcher find        String str   matcher replaceAll         Where string is your string on which you need to remove duplicate white spaces

User · Answer

Though it is too late  I have found a better solution  that works for me  that will replace all consecutive same type white spaces with one white space of its type  That is      Hello  n n nMy    World     will be   Hello  nMy World    Notice there are still leading and trailing white spaces  So my complete solution is   str   str trim   replaceAll     s       1       Here  trim   replaces all leading and trailing white space strings with        s  is for capturing   s  that is white spaces such as        n     t   in group  1    sign is for matching 1 or more preceding token  So    s   can be consecutive characters  1 or more  among any single white space characters         n  or   t     1 is for replacing the matching strings with the group  1 string  which only contains 1 white space character  of the matching type  that is the single white space character which has matched   The above solution will change like this      Hello  n n nMy    World     will be  Hello  nMy World   I have not found my above solution here so I have posted it

User · Answer

Like this   yourString   yourString replaceAll    s            For example  System out println  lorem  ipsum   dolor  n sit   replaceAll    s             outputs  lorem ipsum dolor sit      What does that  s  mean    s  is a regular expression   s matches a space  tab  new line  carriage return  form feed or vertical tab  and   says  one or more of those   Thus the above code will collapse all  whitespace substrings  longer than one character  with a single space character     Source  Java  Removing duplicate white spaces in strings

User · Answer

You can also try using String Tokeniser  for any space  tab  newline  and all  A simple way is   String s    Your Text Here           StringTokenizer st   new StringTokenizer  s         while st hasMoreTokens          System out print st nextToken

User · Answer

This can be possible in three steps    Convert the string in to character array  ToCharArray  Apply for loop on charater array Then apply string replace function  Replace   sting you want to replace    original string

User · Answer

String str       Text    with    multiple    spaces       str   org apache commons lang3 StringUtils normalizeSpace str      str    Text with multiple spaces

[java] How to remove duplicate white spaces in string using Java?

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