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Answer: How would I replace the string 'Red1' with $Red1?

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Q&A > regular expressions > How would I replace the string 'Red1' with $Red[1]? contributed by chipmunk

Actually, it is not necessary to use the /e modifier in the QandAEditors' substitution, because without /e the right-hand side of a substitution interpolates just like a double-quoted string.
$line =~ s/\$red(\d)/$red[$1]/g;

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