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Compare two regex patternsby atemon (Chaplain) |
on Mar 06, 2008 at 04:27 UTC ( [id://672354]=perlquestion: print w/replies, xml ) | Need Help?? |
atemon has asked for the wisdom of the Perl Monks concerning the following question: Hi Monks, I have two regular expressions. $exp1 is stored in a MySQL table and user is entering $exp2 from a UI. We know that $exp1 will match all strings matched by $exp2. So I want to compare the two expressions. If I use any operator like eq or cmp I will get this as unequal. If I compare like $exp1 =~ /^$exp2/ or $exp2 =~ /^$exp1/, it won't match as the meta characters like * has a different meaning on LHS and RHS of =~. Is there a way other than parsing the string to match them? $exp1 is from DB and $exp2 is entered. Since $exp1 will match all expressions that would be matched by $exp2, I dont want to insert $exp2 into DB. Cheers ! --VC
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