php - How to match the whole word when we have a sub-string of it? -

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here code:

$txt  =  'this text'; $word = 'is';  echo  str_replace($word, '<b>'.$word.'</b>', $txt); //=> th<b>is</b> <b>is</b> text

as see, sub-string is in example above , matches is part of this. while need select whole of word. expected result:

//=> <b>this</b> <b>is</b> text

so need check both left , right side of sub-string , match until either first of string ^ or end of string $ or white spage \s.

how can that?

you can use preg_replace achieve regex

http://php.net/manual/en/function.preg-replace.php


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