"range out of order in character class" in PHP regex?

Question

I am trying to get this work for a while but in vain. I want to create a php regex to check if a string has atleast one number and atleast one of the symbols amongst ( _-+=*& )

This is my regex

 $result = preg_match('/^(?=.*\d)(?=.*[_-+=*&]).{3,}$/',$pass);

I get the following error Warning: preg_match() [function.preg-match]: Compilation failed: range out of order in character class at offset 17 in myfile.php on line 8

any help ?

For reference: "regex" is short for "regular expression". Making "regex expression" short for "regular expression expression".</pedantry> :) — cHao
– cHao, Commented Apr 17, 2012 at 2:42
_-+ is wrong. What does - do in a character class ([..])? — user166390
– user166390, Commented Apr 17, 2012 at 2:44
To further @pst's remark: The - in _-+ is the 17th character. — sberry
– sberry, Commented Apr 17, 2012 at 2:45

Alix Axel · Accepted Answer · 2012-04-17 04:15:11Z

25

The - needs to be escaped, or placed at the start / end of the [...] list:

$result = preg_match('/^(?=.*\d)(?=.*[-_+=*&]).{3,}$/',$pass);

If you don't, - is interpreted as the range operator and if x > y in [x-y] you get that error.

edited Apr 17, 2012 at 4:15

answered Apr 17, 2012 at 2:46

Alix Axel

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Alireza · Accepted Answer · 2020-06-05 16:24:20Z

0

I used /u in the end of my pattern when I get this Warning. Just try it. It means Ungreedy pattern

$pattern = "^([ `anything` ])$/u";

answered Jun 5, 2020 at 16:24

Alireza

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