It is true that the OP is not specific enough (far from that), but if you're suggesting /^[a-z0-9_]+$/i, you might as well suggest /^\w+$/. And this is even less specific than the examples shown by the OP.

In reply to Re^4: Looking for a regular expression for the following pattern. by Laurent_R
in thread Looking for a regular expression for the following pattern. by skooma

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