CODEWITHSUNDEEP
javascriptregexcharacter
Andrei Rosu
Andrei Rosu

Reputation: 1417

Regex pattern doesn't validate one character only

The starting and the end letter of the string should be in the interval [a-z0-9]. What's in the middle should be in the same interval [a-z0-9], plus the hyphen(-) character.

My regex pattern is: /^[a-z0-9].*?[a-z0-9-][a-z0-9]$/

It seems to work fine, except for the fact that it doesn't validate a string containing only one valid character. For example, the string 'a'.

Upvotes: 1

Views: 89

Answers (3)

andrewgu
andrewgu

Reputation: 1642

As I understand it, you're looking for any string that consists of entirely lowercase alpha-numeric characters and hyphens, and where the first and last characters must not be a hyphen.

I've modified your RegEx so that it accepts any number of characters, but I'm not sure if that's what you're looking for, or if it's the easiest way. In order to strictly match what you've described, I had to remove part of your original pattern to get:

^(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?)$

Try It Out

Upvotes: 2

Atk
Atk

Reputation: 149

/^([a-z0-9]+-)*[a-z0-9]+$/

a

a-a

a-a-a

Upvotes: 3

Baruch
Baruch

Reputation: 2428

If I understand correctly, you want a RegExp that can match any of these scenarios

aabc-defg abc a-abc abc-a a z0123abc-def4567y

Here's what I got ^[\w\d]*[\-]?[\w\d]*$ Working example: http://regexr.com/3gh4o

EDIT:

This was a suggested edit: /^[0-9a-z]*[-]?[0-9a-z]*$/, could also work.

Upvotes: 2

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