Better: 

eval "\$source =~ s/\$find/\$replace/$opt";

[download]

Even better: 

$opt =~ /[^imsx]/
   and die(...);

eval "\$source =~ s/\$find/\$replace/$opt";

[download]

In reply to Re^2: How do I change substitution options within a program? by ikegami
in thread How can I change substitution options within a program? by b2sing4u

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