I have general question about regular expressions ...

# announcements

[igor.wojda]

I have general question about regular expressions
In Javascript we can do this const matches = str.match(/[aei]/gi) to check if string contains a, e or i character. However In kotlin this does not work. I wonder are the regular expression general cross-language concept or each language has own implementation (similar to other languages yet different)?

[hudsonb]

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/-regex/index.html

[bloder]

can't u use matches?

[bloder]

str.matches(Regex("/[aei]/gi")) ?

[igor.wojda]

I can use it however it behaves differently then in js. Thats why I wonder - is the syntax that defines regular expression itself a cross-language standard?

[dalexander]

Looks like there’s a standard but I don’t know how much it’s followed: https://en.wikipedia.org/wiki/Regular_expression#Standards. There’s a lot of similarities between regular expressions in different languages, but there are also some differences and certain features that some languages support that others don’t (ie. back referencing capture groups).

[bloder]

yeah the regex used in kotlin to make it work is different from that used with js

str.matches(Regex("[aei]"))

this works

[gildor]

Regexp implementation in Kotlin compatible with Java regexp

[gildor]

Same for js and Native