how to check for special characters php

Question

Possible Duplicate:
preg_match php special characters

Hi all, I want to check if these characters exist in a string by using preg_match:

^'£$%^&*()}{@'#~?><>,@|\-=-_+-¬'

Help please!

Same as your previous question: [preg_match php special characters](http://stackoverflow.com/questions/3937569/preg-match-php-special-characters) — Felix Kling, Oct 14 '10 at 22:15
Btw, "white-list strategy" is more efficient and "correct": in this case you need to check if all characters are in allowed set. — zerkms, Oct 15 '10 at 01:55

chigley · Accepted Answer · 2010-10-14T22:26:14.387

87

<?php

$string = 'foo';

if (preg_match('/[\'^£$%&*()}{@#~?><>,|=_+¬-]/', $string))
{
    // one or more of the 'special characters' found in $string
}

edited Oct 14 '10 at 22:26

answered Oct 14 '10 at 22:20

chigley

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Is there a way to get the position of the special characters? – Snickbrack Jul 28 '15 at 09:58
2

It's pretty obvious and he commented the explaination inside the code. – AlexioVay Jan 11 '17 at 09:16
1

This example does not seem to work, I have tested here : http://phptester.net/ and on my xampp server and get FATAL ERROR syntax error, unexpected '$', expecting ')' on line number 5 – L. Ouellet Mar 16 '21 at 14:57
There is a duplicate in the pattern ">" – Reynadan Dec 05 '22 at 13:36

score 10 · Answer 2 · answered Oct 15 '10 at 01:47

10

preg_match('/'.preg_quote('^\'£$%^&*()}{@#~?><,@|-=-_+-¬', '/').'/', $string);

answered Oct 15 '10 at 01:47

Petah

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Didn't realize that `preg_quote` was an available function. May be useful to some. – Chad Feb 27 '19 at 16:59

how to check for special characters php

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