Question

Need help with a regular expression to replace

"CALLID = DB4EC1F310000134255A83470A7B6A4B ID = DB..."

with

"CALLID = <a>DB4EC1F310000134255A83470A7B6A4B</a> ID = DB..."

Answer 1

You can do something like this

(?<=CALLID = )(\S+)

and replace with

<a>$1</a>

In Perl

my $s = "CALLID = DB4EC1F310000134255A83470A7B6A4B ID = DB...";
$s =~ s/(?<=CALLID = )(\S+)/<a>$1<\/a>/;

See it here on Regexr

(?<=CALLID = ) is a lookbehind assertion, it ensures that CALLID = is before the pattern you want to replace.

(\S+) is matching a series of at least one non whitespace characters and store it in $1, because of the brackets around it.