Groovy - Extract a string between two different strings

Question

I have files names in the below format -

India_AP_Dev1.txt
USA_GA_QA2.txt
USA_NY_AWSDev1.txt
AUS_AA_BB_QA4.txt

I want to extract only the environment part from the file name i.e. Dev1, QA2, AWSDev1, QA4etc. How can I go about with this type of file names. I thought about substring but the environment length is not constant. Is it possible to do it with regex

Appreciate your help. TIA

score 2 · Accepted Answer · answered Nov 28 '17 at 07:33

2

It is definitely possible using lookarounds:

(?<=_)[^._]*(?=\.)

(?<=_) match is preceded by _
[^._] take all characters except . and _
(?=\.) match is followed by .

Demo

answered Nov 28 '17 at 07:33

PJProudhon

835
15
17

`def regexformat = "(?<=_)[^._]*(?=\.)" Matcher digitMatcher = Pattern.compile(regexformat).matcher(jsoname);` i am trying out this way but i see the error `unexpected char: '\'`. any suggestions please. `jsoname` will have my file name – sdgd Nov 28 '17 at 09:22
found the issue, one more `\\` is required – sdgd Nov 28 '17 at 09:26
thanks PJ. this worked like a charm!! – sdgd Nov 28 '17 at 09:57

Groovy - Extract a string between two different strings

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