CODEWITHSUNDEEP
regexactionscript-3apache-flexactionscript
Koby Douek
Koby Douek

Reputation: 16693

Actionscript regular expression for repeating characters

I want to implement a regular expression check for a string with a character which repeats itself more than twice. I am using ActionScript 3.

i.e.:

koby = true
kobyy = true
kobyyy = false

I tried using 

/((\w)\2?(?!\2))+/

but it does not seem to work (using RegExp.test())

Upvotes: 1

Views: 170

Answers (2)

gabriel
gabriel

Reputation: 2359

I also tried this one:

var regExp:RegExp = new RegExp('(\\w)\\1{2}');
trace(!regExp.test('koby'));
trace(!regExp.test('kobyy'));
trace(!regExp.test('kobyyy'));

Upvotes: 1

stema
stema

Reputation: 93086

If you want to invalidate the complete string, when there is a character repeated 3 times, you can use a negative lookahead assertion:

^(?!.*(\w)\1{2}).*

See it here on Regexr.

The group starting with (?! is a negated lookahead assertion. That means the whole regex (.* to match the complete string) will fail, when there is a word character that is repeated 3 times in the string.

^ is an anchor for the start of the string.

^         # match the start of the string
(?!.*     # fail when there is anywhere in the string
    (\w)  # a word character
    \1{2} # that is repeated two times
)
.*        # match the string

Upvotes: 3

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