the regular expression works in Java, but not in Javascript

Question

I have a regular expression like

f[u\W&&[^\s,]][c\W&&[^\s,]]?k(?!(uoka|uyama|ushima|nowledge))

to find some f words, but it works in Java, but it cannot find the f words in Javascript, what's the difference for this expression in Java and javascript? and how to solve it, anyone can give me an idea, thanks.

I tried to change "]]" to "]", seems it works in Javascript, but I don't know why, the bracket is not paired in this way

You need to provide examples of the data you're working with and expected results — Tibrogargan
– Tibrogargan, Commented Nov 30, 2022 at 5:15

trincot · Accepted Answer · 2022-11-30 11:26:51Z

1

JavaScript does not support the class intersection operator &&.

So in particular, JavaScript does not deal with && in that way when it parses [u\W&&[^\s,]]. Java interprets this as:

Match a character that is either u or a non-alphanumerical character, but not a white-space or a comma.

You can convert this by using a negative look ahead for the "but not..." part: (?![\s,])[u\W]. The same workaround will work for [c\W&&[^\s,]].

So that leads to this regex:

f(?![\s,])[u\W](?![\s,])[c\W]?k(?!(uoka|uyama|ushima|nowledge))

answered Nov 30, 2022 at 11:26

trincot

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