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Re: REgular expression to check the string that allows "a","b" and "c" to occur only once in any order.

by oha (Friar)
on Dec 11, 2007 at 10:12 UTC ( [id://656363]=note: print w/replies, xml ) Need Help??

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  1. or download this
    print "ok!\n" unless /([abc]).*\1/;
  2. or download this
    print "ok!\n" unless /(([abc]).*\2|[^abc])/;

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