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Re: How to avoid the duplication in a string

by jonadab (Parson)
on Oct 22, 2008 at 11:39 UTC ( #718708=note: print w/replies, xml ) Need Help??


in reply to Re^2: How to avoid the duplication in a string
in thread How to avoid the duplication in a string

could you please explain what is the meaning for \1+ in perl

In regular expressions, backslashed numeric digits are references back to the preceding captures. So \1 refers to the same thing that was captured in the first set of parentheses, and \2 refers to the same thing that was captured in the second set, and so forth.

As for the +, it modifies a backreference in exactly the same way it modifies any other atom in a regular expression.

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[1nickt]: Yaerox probably best to whip up an SSCCE demonstrating the failure in what you have now and post to SoPW as a question.
[Corion]: Yaerox: That's a somewhat hard problem. Encode solves the conversion part, but for guessing what encoding a file is in, that's the hard part
[Corion]: Yaerox: There is Encode::Guess, but that needs a limited set of inputs, and it also cannot handle multiple single-byte encodings
[Corion]: If you have a BOM, that's a really easy way to recognize UTF-8. Otherwise, you can try to decode a file from UTF-8, and if that works OK and doesn't crash, most likely the file was valid UTF-8
[Corion]: But as "ansi" (Latin-1?) is a single-byte encoding, any file is a valid ANSI file

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