INTERVIEW QUESTIONS PROGRAMMING LANGUAGES PERL DETAILS

Question: "perl regular expressions are greedy" what does this mean?

Answer: Perl regular expressions normally match the longest string possible. that is what is called as "greedy match" For instance:my($text) = "mississippi";$text =~ m/(i.*s)/;print $1 . " ";Run the preceding code, and here's what you get:ississIt matches the first i, the last s, and everything in between them. But what if you want to match the first i to the s most closely following it? Use this code:my($text) = "mississippi";$text =~ m/(i.*?s)/;print $1 . " ";Now look what the code produces:is

Perl regular expressions normally match the longest string possible. that is what is called as "greedy match" For instance:my($text) = "mississippi";$text =~ m/(i.*s)/;print $1 . " ";Run the preceding code, and here's what you get:ississIt matches the first i, the last s, and everything in between them. But what if you want to match the first i to the s most closely following it? Use this code:my($text) = "mississippi";$text =~ m/(i.*?s)/;print $1 . " ";Now look what the code produces:is Source: CoolInterview.com

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