regex - regx - extracting everything between an underscore and a dot from text -


i trying extract between _ , . in text:

cil20150424_nsgs02rpk.dat cil20150424_nsu01mah.dat

to give me these matches: 

nsgs02rpk nsu01mah

i using site , best can locate _ using negitive ahead:

\d(_=?)

but selects 4 4_.

how select between _ , . in text?

this regex matches target:

(?<=_).*?(?=\.)

see live demo.

the regex uses behind underscore, reluctant quantifier (in case there's more 1 per line), , ahead dot (which must escape match literal dot).

btw attempt @ ahead (_=?) not ahead, it's captured (bracketed) underscore followed optional equals sign.


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