Javascript reg ex to match whole word only, bound only by whitespace

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You can try: \sBlah\s.

Or if you allow beginning and end anchors, (^|\s)Blah(\s|$)

This will match "Blah" by itself, or each Blah in "Blah and Blah"

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Lookahead variant

If you want to match both Blah in "Blah Blah", then since the one space is “shared” between the two occurrences, you must use assertions. Something like:

(^|\s)Blah(?=\s|$)

See also

Capturing only Blah

The above regex would also match the leading whitespace.

If you want only Blah, ideally, lookbehind would’ve been nice:

(?<=^|\s)Blah(?=\s|$)

But since Javascript doesn’t support it, you can instead write:

(?:^|\s)(Blah)(?=\s|$)

Now Blah would be captured in \1, with no leading whitespace.

See also

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