php - modify string if specific regex matches -

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working in php, have following mock string.

"width 40cm height 70cm"

if string not contain colon , have space followed number, want add colon before space.

the end result i'm looking is:

"width: 40cm height: 70cm"

i tried bunch of ways regex , splitting string @ match add colon, removing match string. here attempt.

    if(strpos($s, ':') === false) {         $array = preg_split('/([0-9])/', $s, -1, preg_split_no_empty);         $array[0] = trim($array[0]) . ':';         $s = implode('', $array);     }

i think work

(\w+)(?=\s+\d)      <------->      lookahead match      space followed       digits

regex demo

php code

$re = "/(\\w+)(?=\\s+\\d)/m";  $str = "width 40cm height 70cm\nwidth: 40cm height 70cm";   $result = preg_replace($re, "$1:", $str); print_r($result);

ideone demo


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