preg_match( '/[a-z1-9]{2,5}-\d(\.\d)?/', "example.com - ABC-1.0", $match);
This is working at http://gskinner.com/RegExr/. I get the expected matches there - it matches "ABC-1.0". But not using preg_match. The matches array is empty.
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Michelle Williamson
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Use `$preg_match_all()` – Sterling Archer Oct 02 '13 at 22:06
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[Check the documentation and examples for `preg_match()`.](http://php.net/manual/en/function.preg-match.php) – PeeHaa Oct 02 '13 at 22:07
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Possible duplicate of [PHP error using the preg_match function](http://stackoverflow.com/questions/19114821) – cmbuckley Oct 02 '13 at 22:11
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I've edited my question. I'm not getting an error. I just get an empty array. – Michelle Williamson Oct 02 '13 at 22:12
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Why was my question voted down? – Michelle Williamson Oct 02 '13 at 22:13
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preg_match_all just gives me an array of 2 empty arrays. – Michelle Williamson Oct 02 '13 at 22:14
3 Answers
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You need to use delimiters when using PCRE functions. You also need the regex to be case insensitive.
preg_match('/[a-z1-9]{2,5}-\d(\.\d)?/i'
Explosion Pills
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@MichelleWilliamson `a` will not match `A` without case insensitivity (the `/i`) – Explosion Pills Oct 02 '13 at 22:13
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You can add case insensitivity inside the regex using a modifier group.
Also note that the group 1 is optional, so if it doesn't find a .number group 1 will be empty.
/(?i)[a-z1-9]{2,5}-\d(\.\d)?/
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If you know the ABC part should always match uppercase letters, you can make it explicit by using [A-Z1-9]
Better to be explicit than vague when it comes to regexes.
abstr
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