How to exclude special characters in a regular expression

Question

Possible Duplicate:
PHP - regex to allow letters and numbers only

I need a RegEx that matches a-z, A-Z and 0-9 strings. Not á, à, ð, ð, ü, ĉ, etc. How can I accomplish this?

So many examples in the manual! http://php.net/manual/en/function.preg-match.php — mario, Nov 14 '11 at 04:39

score 3 · Answer 1 · answered Nov 14 '11 at 04:38

3

Try that one for example:

^[a-zA-Z0-9]*$

answered Nov 14 '11 at 04:38

Petar Ivanov

Still matches á, é, ù,... for some reason :S – federico-t Nov 14 '11 at 04:39
@John: Does `setlocale(LC_ALL, 'C');` fix it? – icktoofay Nov 14 '11 at 04:41
1

@JohnDoe: Doesn't for me: http://ideone.com/Lpeeh – Ry- Nov 14 '11 at 04:41
@icktoofay that somehow made the trick. Thanks :) – federico-t Nov 14 '11 at 04:45
@icktoofay: Can you explain what's happening here? I'm shocked that PHP would ignore a clearly defined character range. Is that the default behavior? – Tim Pietzcker Nov 14 '11 at 09:37
@Tim: No, I don't know why it does that. Sorry. – icktoofay Nov 15 '11 at 04:23

score 0 · Answer 2 · answered Nov 14 '11 at 04:38

0

Use a character class to match a single character:

[a-zA-Z0-9]

Apply quantifiers (*, +, whatever) as appropriate.

answered Nov 14 '11 at 04:38

Karl Knechtel

2 Answers2