正则表达式匹配这种模式

Question

i have parsed some text files using stanford nlp from that output i need to extract text which matches below pattern

open bracket followed by NP or NNP or NNS etc

Input string

(NP (DT the) (NNP sample) (NN program))

result string

the ) sample ) program )

I have tried the below regex but it's not matching my required pattern

test.replaceAll("//(//NP|//(//JJ|//(//NNS|//(//NNP|//(//NN|//(//DT|//(//CD|//(//FW|//(//WHNP|//(//WDT|//(//VBN|//(//PRP", "")

Answer 1

I don't know why you have all those slashes in there.

Try this:

test = test.replaceAll("\\((NP|JJ|NNS|NNP|NN|DT|CD|FW|WHNP|WDT|VBN|PRP)", "");

Here's a live demo of this code working (correctly).

Answer 2

Try "\\\\(NP|\\\\(JJ|\\\\(NNS|\\\\(NNP|\\\\(NN|\\\\(DT|\\\\(CD|\\\\(FW|\\\\(WHNP|\\\\(WDT|\\\\(VBN|\\\\(PRP"

Slashes are wrong. Use \\\\ instead of /