CODEWITHSUNDEEP
javascriptregex
Vanya Makhlinets
Vanya Makhlinets

Reputation: 248

Customize email regexp to allow insert hyphens

I have email regexp which looks like this:

/^[_a-z0-9]+(\.[_a-z0-9]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,10})$/

The challange is to allow insert hyphen '-' before @ symbol, but with some restrictions:

1)E-mail can't start with hyphen

2)Hyphen can't be before @ symbol.

3)2 hyphens in a row '--' aren't allowed.

Upvotes: 1

Views: 341

Answers (2)

Shervin Mirostovar
Shervin Mirostovar

Reputation: 9

You may try this:

^[_a-z0-9]+(\.[_a-z0-9]+)*@(?!.*--)[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,10})$

3)2 hyphens in a row '--' aren't allowed.

See https://regex101.com/r/r7iCEN/1

Upvotes: 0

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626929

You may replace the first \. with a [.-] character class that matches either . or -:

^[_a-z0-9]+(?:[.-][_a-z0-9]+)*@[a-z0-9-]+(?:\.[a-z0-9-]+)*\.[a-z]{2,10}$
              ^^^^

See the regex demo

I also removed unnecessary groupings and converted capturing groups to non-capturing to streamline matching.

Upvotes: 1

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