CODEWITHSUNDEEP
javascriptregex
mahadazad
mahadazad

Reputation: 551

Having trouble with regular expression in javascript

I am trying to construct a regular expression which parses mentions. e.g.

@aaa @bbb@ccc @dddd @eeee

it should match only aaa, dddd and eeee but not bbb@ccc

I have tried the following regular expression but it fails:

/(?:^|\s)@(\S+)/g

an example can be found here: https://regexr.com/3h9o5

Upvotes: 0

Views: 53

Answers (2)

miggy92
miggy92

Reputation: 70

Your RE doesn't match because of \S. \S match @ too, so you need to replace it for what a name should be. Your RE should be something like

/(?:^|\s)@([^@\s]+)/g

Here it will match just 'aa' from '@aa@'. If you want whitespaces after the name you should use

/(?:^|\s)@([^@\s]+)(?=\s|$)/g

Upvotes: 1

anubhava
anubhava

Reputation: 785146

You can use this regex with \B and negated character class:

\B@([^@\s]+)(?=\s|$)

RegEx Demo

RegEx Breakup:

  • \B: assert position where \b does not match
  • [^@\s]+: Match 1 or more characters that are not @ and not a whitespace
  • (?=\s|$): Lookahead to assert that we have whitespace or end of line at next position

Upvotes: 2

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