Javascript Regex for a partial string match only

javascript regex string match partial

14,387

Solution 1

You want to use a non-word boundary \B here.

/\Batta|atta\B/

sp00m almost got it right

^(atta.+|.+atta|.+atta.+)$

If whitespace is not allowed you could write

^(atta[\S]+|[\S]+atta|[\S]+atta[\S]+)$

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Updated on June 05, 2022

maurya8888 almost 2 years
I need to write a JavaScript RegEx that matches only the partial strings in a word.

For example if I search using the string 'atta'

it should return
```
true for khatta
true for attari
true for navrattan
false for atta
```
I am not able to figure how to get this done using one RegEx. Thanks!
sp00m almost 10 years

Or even ^(atta.+|.+atta.*)$ ;)
chris97ong almost 10 years

Hmm...so atta gives false but atta gives true.
Per Hornshøj-Schierbeck almost 10 years

I think this is a much cleaner answer than mine
MaxArt almost 10 years

Good one. I may add that for test the capturing group is useless and memory consuming. I wonder if !/\batta\b/.test(string) isn't any faster...
Lee Kowalkowski almost 10 years

@MaxArt would that not also match "foobar"? If you're really worried about capturing groups, use a non-capturing group: /(?:\Batta|atta\B)/
maurya8888 almost 10 years

I believe !/\batta\b/.test(string) will return true for "this too". I need a partial match at least.
MaxArt almost 10 years

Yep, /\batta\b/ would match strings that also don't contain "atta" at all - I guess OP doesn't want that. @LeeKowalkowski There's no need to have groups either, in this case.
Lee Kowalkowski almost 10 years

@MaxArt oh how right you are! I seemed to have thought the brackets were always required for |. I will edit my answer (and a few regexes I have lying around ha ha)