< evkaky> Currently there s no way to do it with `Regex` cla kotlinlang #announcements

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Title

ilya.gorbunov

08/03/2017, 5:30 PM

@evkaky Currently there's no way to do it with

Regex

class. You can resort to

java.util.regex.Pattern

API

val pattern = "[0-9]+".toPattern()
val matcher = pattern.matcher(string).region(startIndex, string.length)
if (matcher.lookingAt()) { ... }

evkaky

08/03/2017, 7:18 PM

Thank you!!! Now I can write my own efficient lexer without pain with hand-written finite automatons for each token class. (I know about lexer generators, but I can’t use them in my code kata) But is there any chance that similar api will be added to the kotlin’s

Regex

@ilya.gorbunov come back, pls

ilya.gorbunov

08/04/2017, 6:00 PM

You can have this api as an extension of Regex class, just call its

toPattern()

method and do the code above with the returned

Pattern

instance.

We could add something like that in the stdlib, but we need to investigate the use cases first to design API that suits them. Please open an issue in YouTrack (kotl.in/issue), and describe yours. Also it likely won't be crossplatform, 'cause JS regexps do not support such functionality.

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