Your criteria are a little under specified, however the following works, for what you've asked. 
#!/usr/bin./perl

use strict;
use warnings;

my @in=("TFS100","TFS 100","TFS-CR100",
        "TFS-CR 100","TFS_100","TFS ID 100",
        "TFS CR 100","TFS ID100","TFS-ID 100",
        "TFS ID:100","TFS-ID: 100",
        "- TFS CR634: STRESS: H 17326,21600,",
        "CR0080588","TFS0080588"
       );
for (@in){
    print "$1\n" if /TFS[-_\s]?(?:CR|ID)?\s?([1-9]\d+)/;
}

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print "Good ",qw(night morning afternoon evening)[(localtime)[2]/6]," fellow monks."

In reply to Re: Problem with regular expression by Utilitarian
in thread Problem with regular expression by MARVion

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