A regular expression to exclude a word/string

I have a regular expression as follows:

^/[a-z0-9]+$

This matches strings such as /hello or /hello123 .

However, I would like it to exclude a couple of string values such as /ignoreme and /ignoreme2 .

I've tried a few variants but can't seem to get any to work!

My latest feeble attempt was

^/(((?!ignoreme)|(?!ignoreme2))[a-z0-9])+$

Any help would be gratefully appreciated :-)

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Here's yet another way: (using a negative look-ahead):

^/(?!ignoreme|ignoreme2|ignoremeN)([a-z0-9]+)$ 

Note: There's only only one capturing expression: ([a-z0-9]+) .

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This should do it:

^/b([a-z0-9]+)b(?<!ignoreme|ignoreme2|ignoreme3)

You can add as much ignored words as you like, here is a simple PHP implementation:

$ignoredWords = array('ignoreme', 'ignoreme2', 'ignoreme...');

preg_match('~^/b([a-z0-9]+)b(?<!' . implode('|', array_map('preg_quote', $ignoredWords)) . ')~i', $string);

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As you want to exclude both words, you need a conjuction:

^/(?!ignoreme$)(?!ignoreme2$)[a-z0-9]+$

Now both conditions must be true (neither ignoreme nor ignoreme2 is allowed) to have a match.

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