Is it possible to replace a word after a phrase using regular expression in php?

Question

Input text: school of engineering, school of medicine

Output required: school of education, school of education

Rule: any words followed by \'school of\' needs t

Answer 1

No need to capture anything or use lookarounds.

Demo: https://3v4l.org/uWZgW

$inputext = "school of engineering, school of medicine"; 
$rule ="/school of \K[a-z]+/";
$replacetext = "education";
$outputext = preg_replace($rule, $replacetext, $inputext);
echo $outputext;

Match the preceding words (and space after of), restart the fullstring match with \K, then replace the target word.