In Python and Ruby you can duplicate a string by running the multiply operator (*) on a string object, and in perl you can use the x operator. There have been many times when I've looked at this facility and said to myself "very nice, but isn't that a feature looking for a benefit" - in other words, something that's nice but not much use. Well ... there's always a few cases to disprove such a theory:

s/^(\s+)/" " x length($1)/e;

That's Perl - replace all leading spaces on a line with the same number of leading   sequences.
(written 2006-12-07 02:21:58)

 P205 - Perl - Initial String Handling
Y108 - Python - String Handling
R109 - Ruby - Strings and Regular Expressions

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