CODEWITHSUNDEEP
javascriptregexstring
Evelyn Zouras
Evelyn Zouras

Reputation: 103

javascript regexp does not evaluate only one character

I'm using this regexp:

/[^+][a-z]/.test(str)

I'm trying to ensure that if there are any letters ([a-z]) in a string (str) not proceeded by a plus ([^+]) , a match is found and therefore it will return true.

It mostly works except when there is only one character in the string. For example, a returns false, even though there is no plus sign preceding it. How can I ensure it works for all strings including one character strings. Thanks!

Upvotes: 1

Views: 45

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 627517

Add a ^ as an alternative to [^+]:

/(?:^|[^+])[a-z]/.test(str)
 ^^^^^^^^^^

The (?:^|[^+]) is a non-capturing alternation group matching either the start of the string (with ^) or (|) any char other than + (with [^+]).

Upvotes: 1

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