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how to match non-word+word boundary in javascript regex.

"This is, a beautiful island".match(/\bis,\b/)

In the above case why does not the regex engine match till is, and assume the space to be a word boundary without moving further.

coool
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  • See https://stackoverflow.com/a/10983983/3832970 and especially https://stackoverflow.com/questions/1324676/what-is-a-word-boundary-in-regexes – Wiktor Stribiżew May 02 '18 at 14:55

2 Answers2

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\b asserts a position where a word character \w meets a non-word character \W or vice versa. Comma is a non-word character and space is as well. So \b never matches a position between a comma and a space.

Also you forgot to put ending delimiter in your regex.

revo
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You can use \B after comma that matches where \b doesn't since comma is not considered a word character.

console.log( "This is, a beautiful island".match(/\bis,\B/) )
//=> ["is,"]
anubhava
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