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Asked: 2026-06-16T03:38:08+00:00

I’m going to create a regexp for matching the following: The string should should

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I’m going to create a regexp for matching the following:

The string should should consist of only lower case alpha-numeric characters (a-z) and a single ‘-‘ should be allowed within. For example, ‘trash-bin’ should be OK, however, ‘trash–bin’ or ‘-bin’ should not.

How should the regexp look like? Also if it could be explained, I’d be happy.

This is what if have so far:

/^[0-9a-z]+-+$/

UPDATED TO:

^(?!\A-)+[0-9a-z]+-?$

What I don’t know is how to disallow several – to follow each other, or disallow the string to begin with a -.

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1 Answer

  1. Editorial Team
    ^([a-z0-9]+(\-[a-z0-9]+)*)$

    This may do the trick. Test it at http://www.regextester.com/ (select the preg dialect, as it is the one used by php’s preg_* functions)

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