#!/usr/bin/perl

use strict;
use warnings;

$_ = <<'--';
gregarious foo gregarious foo
foo gregarious foo gregarious
gregarious foo gregarious foo
--

s/(gregarious)/\\underline{$1}/g &&
s/\\underline\{(gregarious)\}/\\footnote{$1}/;

print;
 
__END__
\footnote{gregarious} foo \underline{gregarious} foo
foo \underline{gregarious} foo \underline{gregarious}
\underline{gregarious} foo \underline{gregarious} foo

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Abigail

In reply to Re: Combining two Reg Expressions with substitution by Abigail-II
in thread Combining two Reg Expressions with substitution by cranberry13

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