note Samy_rio <p>Hi [Tony1], try like this</p> <code> use strict; use warnings; my $str = 'mASVKSSSSSSSSSFISLLLLILLVIVLQSQVIECQPQQSCTASLTGLNVCAPFLVPGSPTASTECCNAVQSINHDCMCNTMRIAAQIPAQCNLPPLSCSANSSS'; $str =~ s/(.{10})/$1 /g; $str =~ s/(S{3,})/<font color=red>$1<\/font>/g; $str =~ s/<\/font> <font color=red>/ /g; print $str; __END__ Output is: ---------- mASVK<font color=red>SSSSS SSSS</font>FISLLL LILLVIVLQS QVIECQPQQS CTASLTGLNV CAPFLVPGSP TASTECCNAV QSINHDCMCN TMRIAAQIPA QCNLPPLSCS AN<font color=red>SSS</font> </code> <p>Look into this [id://172086]</p> <p>[chargrill]++</p> <!-- Node text goes above. Div tags should contain sig only --> <div class="pmsig"><div class="pmsig-460657"> <p>Regards,<br>Velusamy R.<hr><c>eval"print uc\"\\c$_\""for split'','j)@,/6%@0%2,`e@3!-9v2)/@|6%,53!-9@2~j';</c></p> </div></div> 598254 598254