CODEWITHSUNDEEP
regex
George Johnston
George Johnston

Reputation: 32258

Regex Letters, Numbers, Dashes, and Underscores

Im not sure how I can achieve this match expression. Currently I am using, 

([A-Za-z0-9-]+)

...which matches letters and numbers. I would also like to match on dashes and underscores in the same expression. Anyone know how?

I would like to be able to match product_name and product-name

Upvotes: 80

Views: 164173

Answers (4)

Marius
Marius

Reputation: 3501

You can indeed match all those characters, but it's safer to escape the - so that it is clear that it be taken literally.

If you are using a POSIX variant you can opt to use:

([[:alnum:]\-_]+)

But a since you are including the underscore I would simply use:

([\w\-]+)

(works in all variants)

Upvotes: 2

Mark Byers
Mark Byers

Reputation: 838076

Depending on your regex variant, you might be able to do simply this:

([\w-]+)

Also, you probably don't need the parentheses unless this is part of a larger expression.

Upvotes: 21

John Knoeller
John Knoeller

Reputation: 34128

Just escape the dashes to prevent them from being interpreted (I don't think underscore needs escaping, but it can't hurt). You don't say which regex you are using.

([A-Za-z0-9\-\_]+)

Upvotes: 138

waxwing
waxwing

Reputation: 18743

Your expression should already match dashes, because the final - will not be interpreted as a range operator (since the range has no end). To add underscores as well, try:

([A-Za-z0-9_-]+)

Upvotes: 22

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