Groovy - Extract a string between two different strings [duplicate]

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

PJProudhon · Accepted Answer · 2017-11-28 07:33:00Z

2

It is definitely possible using lookarounds:

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

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

Demo

answered Nov 28, 2017 at 7:33

PJProudhon

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3 Comments

sdgd Over a year ago

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 Over a year ago

found the issue, one more `\` is required

sdgd Over a year ago

thanks PJ. this worked like a charm!!

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