Php regex, match pattern?

Question

I am trying to make a regex that will match this pattern,

Must be 40 characters long,

Must contain only letters and numbers,

Must contain no spaces,

Case insensitive,

So far I have come up with this but it does not work;

/^[0-9a-f]+$/i

Thanks

The a-f bit is odd. You don't want to match on G through Z? Are you trying to match hexadecimal digits? If so, note that the maximum value of a hexadecimal digit is e (decimal 15), not f (decimal 16 is 10 in hex). — Garrett Albright
– Garrett Albright, Commented May 21, 2012 at 14:09
…Oh. Now that I count on my third hand, I see you're right. Well, that's embarrassing. — Garrett Albright
– Garrett Albright, Commented May 22, 2012 at 4:15

Paul · Accepted Answer · 2012-05-21 13:35:36Z

4

/^[0-9a-f]{40}$/i

should do the trick. The number in curly brackets defines the number of characters.

answered May 21, 2012 at 13:35

Paul

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Comments

John Conde · Accepted Answer · 2012-05-21 13:35:07Z

2

Try this regex:

/^[\da-z]{40}$/i

If you really only want the letters a-f then use:

/^[\da-f]{40}$/i

answered May 21, 2012 at 13:35

John Conde

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\w should also match underscores (_), which I do not think is something the OP is after.

erdeszt · Accepted Answer · 2012-05-21 13:36:41Z

1

Try this:/^[0-9a-z]{40,40}$/i

answered May 21, 2012 at 13:36

erdeszt

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{40,40} can be replaced by {40}.

A Single number between curly braces denotes an exact number which must be matched :).