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Extracting string between "_" and "."

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# 1  
Old 03-02-2009
Question Extracting string between "_" and "."
Hi, I got several files with this format

1.1.1.1_fa0_1.html or 1.1.1.1_vl100.html

and I need just the fa0_1 or the vl100 string. I managed to extract from the vl100 with

baseline 1.1.1.1_vl100.html .html | awk -F"_" '{print $NF}'

but obviously that command gets only "1" in the fa0_1 example Smilie

I'll appreciate any help
# 2  
Old 03-02-2009
Code:
$ echo '1.1.1.1_fa0_1.html' | sed 's/^[^_][^_]*_\([^.][^.]*\).*/\1/'

# 3  
Old 03-02-2009
wow, THAT was fast! xD tnx a lot I'll try that out right now Smilie
# 4  
Old 03-02-2009
Yeah, it worked like a charm, thank you very much
# 5  
Old 03-02-2009
Code:
#!/usr/bin/perl
use strict;
my @arr=('1.1.1.1_vl100.html','1.1.1.1_fa0_1.html','1.1.1.1_vl111_123.html','1.1.1.1_fa1_1_234.html');
map {print $1,"\n" if /(?:^.*?_)([^_]*)(?:[\._].*$)/} @arr;

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