PHP使用RegEx从字符串中捕获包含特殊字符的单词

Question

I have special words in a string that i would like to capture based on the prefix.
Example Special words such as ^to_this should be caught.
I would need the word this because of the special prefix ^to_.
Here is my attempt but it is not working

preg_match('/\b(\w*^to_\w*)\b/', $str, $specialWordArr); 

but this returns an empty array

Answer 1

Your code would be,

<?php
$mystring = 'Special words such as ^to_this should be caught';
$regex = '~[_^;]\w+[_^;](\w+)~';
if (preg_match($regex, $mystring, $m)) {
    $yourmatch = $m[1]; 
    echo $yourmatch;
    }
?>  //=> this

Explanation:

• [_^;] Add the special characters into this character class to ensure that the begining of a word would be a special character.
• \w+ After a special character, there must one or more word characters followed.
• [_^;] Word characters must be followed by a special character.
• (\w+) If these conditions are satisfied, capture the following one or more word characters into a group.