Replace last occurrence of a string in a string

Question

Anyone know of a very fast way to replace the last occurrence of a string with another string in a string  Note  the last occurrence of the string might not be the last characters in the string  Example   search    The    replace    A    subject    The Quick Brown Fox Jumps Over The Lazy Dog    Expected Output  The Quick Brown Fox Jumps Over A Lazy Dog

User · Answer

This is an ancient question  but why is everyone overlooking the simplest regexp-based solution  Normal regexp quantifiers are greedy  people  If you want to find the last instance of a pattern  just stick    in front of it  Here s how    text    The quick brown fox  fox  fox  fox  jumps over etc     fixed   preg replace       fox      1DUCK    text   print  fixed     This will replace the last instance of  fox  to  DUCK   like it s supposed to  and print   The quick brown fox  fox  fox  DUCK  jumps over etc

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string    picture 0007 value    findChar  strrpos  string       if  findChar     FALSE       string  findChar          echo  string    Apart from the mistakes in the code  Faruk Unal has the best anwser  One function does the trick

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Another 1-liner but without preg    subject    bourbon  scotch  beer    search         replace      and    echo strrev implode strrev  replace   explode strrev  search   strrev  subject   2       output  bourbon  scotch  and beer

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While using regex is typically less performant than non-regex techniques  I do appreciate the control and flexibility that it affords  In my snippet  I will set the pattern to be case-insensitive   i  although my sample input will not challenge this rule  and include word boundaries   b  although they were not explicitly called for   I am also going to use the  K metacharacter to reset the fullstring match so that no capture groups   backreferences are needed  Code   Demo   search    The    replace    A    subject    quot The Quick Brown Fox Jumps Over The Lazy Dog s Thermos  quot    echo preg replace                K b    preg quote  search           b i             replace            subject          Output    The Quick Brown Fox Jumps Over A Lazy Dog s Thermos                                                      not replaced                replaced        not replaced   Without word boundaries   Demo  echo preg replace                K    preg quote  search           i             replace            subject          Output    The Quick Brown Fox Jumps Over The Lazy Dog s Armos                                                      not replaced              not replaced        replaced

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string    this is my world  not my world    find    world    replace    farm    result   preg replace strrev    find    strrev  replace  strrev  string  1   echo strrev  result     output  this is my world  not my farm

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This will also work   function str lreplace  search   replace   subject        return preg replace           preg quote  search                     1     replace     2    subject  1       UPDATE Slightly more concise version  http   ideone com B8i4o    function str lreplace  search   replace   subject        return preg replace           preg quote  search                1     replace   subject  1

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You could do this    str    Hello world    str   rtrim  str   world      John     Result is   Hello John    Regards

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You can use strrpos   to find last match    string    picture 0007 value    findChar  strrpos  string         string  findChar        echo  string    Output   picture 0007 value

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A short version    NewString   substr replace  String  Replacement strrpos  String  Replace  strlen  Replace

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You can use this function   function str lreplace  search   replace   subject         pos   strrpos  subject   search        if  pos     false                 subject   substr replace  subject   replace   pos  strlen  search               return  subject

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Below corrected zack s code  https   stackoverflow com a 11144999 9996503   Be careful with regular expressions  Consider this   string    Round brackets  parentheses   quot    quot   square brackets  quot    quot     find          replace            Zack s code   result   preg replace strrev  quot   find  quot   strrev  replace  strrev  string  1   var dump  result      Output  NULL    Correct code   result   strrev preg replace     preg quote strrev  find        strrev  replace   strrev  string   1    echo  result    Output  Round brackets  parentheses   quot    quot   square brackets  quot    quot

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For the interested  I ve written a function that utilises preg match so that you re able to replace from right hand side using regex   function preg rreplace  search   replace   subject        preg match all  search   subject   matches  PREG SET ORDER        lastMatch   end  matches        if   lastMatch  amp  amp  false      pos   strrpos  subject   lastMatchedStr    lastMatch 0               subject   substr replace  subject   replace   pos  strlen  lastMatchedStr               return  subject      Or as a shorthand combination implementation of both options   function str rreplace  search   replace   subject        return  false      pos   strrpos  subject   search             substr replace  subject   replace   pos  strlen  search      subject    function preg rreplace  search   replace   subject        preg match all  search   subject   matches  PREG SET ORDER       return   lastMatch   end  matches     str rreplace  lastMatch 0    replace   subject     subject      based on https   stackoverflow com a 3835653 3017716 and https   stackoverflow com a 23343396 3017716

User · Answer

The following rather compact solution uses the PCRE positive lookahead assertion to match the last occurrence of the substring of interest  that is  an occurrence of the substring which is not followed by any other occurrences of the same substring  Thus the example replaces the last  fox  with  dog     string    The quick brown fox  fox  fox jumps over the lazy fox      echo preg replace    fox     fox       dog    string     OUTPUT  nbsp   The quick brown fox  fox  fox jumps over the lazy dog

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Shorthand for accepted answer  function str lreplace  search   replace   subject        return is numeric  pos strrpos  subject  search        substr replace  subject  replace  pos strlen  search    subject

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Use the     on a reg expression to match the end of the string   string    The quick brown fox jumps over the lazy fox   echo preg replace   fox      dog    string      output  The quick brown fox jumps over the lazy dog

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