正则表达式pcre替换不匹配组的匹配组？

Question

someone can give me an example for example for this string

wordride plain fire

replace the spaces by another letter

for example replace

the first match space for the third letter before the space

for example i want to replace character after word using this

   (?:\G(?!^)|word)\K.

replace character by word usign a "word" as group

      (?:\G(?!^)|(word))\K.

using $1$2

but not work

how could solve this problem

in this case

     wordride plain fire

for example when the algorithm search "r" replace this by the group "word"

obtain

     wordwordide plain fire 

i want to find all letter after word character by character ( ride .......) and replace by group word using subtitution $1 $2 etc

please help me

Answer 1

To replace letter after word by captured group, you can use:

$s = 'wordride plain fire';

$r = preg_replace('/(?>(word)|\G(?<!^))\K\S/', '$1', $s, 1);

//=> wordwordide plain fire 

RegEx Demo