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A couple of ways:
$str =~ s/589HC-CG26G-133578.*/589HC-CG26G-133578/; $str =~ s/589HC-CG26G-133578\K.*//; $str =~ s/(589HC-CG26G-133578).*/$1/; ($str) = $str =~ /(.*589HC-CG26G-133578)/; ($str) = $str =~ /.*589HC-CG26G-133578/g; $str = substr($str, 0, index($str, "589HC-CG26G-133578") + length("589 +HC-CG26G-133578")); substr($str, index($str, "589HC-CG26G-133578") + length("589HC-CG26G-1 +33578"), -1) = ""; $str = join "", (split /(589HC-CG26G-133578)/, $str)[0, 1];

In reply to Re: Perl regular expression by JavaFan
in thread Perl regular expression by danny0085

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