Hi finddata,
You can try this for your current input data assuming only one _ is there,
#!/usr/local/bin/perl
use strict;
use warnings;

my $str = 'DEMO_.perl';
$str =~ s/\_//;
print $str;

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In reply to Re: How to remove underscore before every dot using perl? by madtoperl
in thread How to remove underscore before every dot using perl? by finddata

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