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Regular expressions simplify pattern-matching code

Discover the elegance of regular expressions in text-processing scenarios that involve pattern matching

By Jeff Friesen, JavaWorld.com, 02/07/03

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Page 8 of 16

  • Subtraction: consists of all characters except for those indicated in nested negation character classes and matches the remaining characters. Example: [a-z&&[^m-p]] matches characters a through l and q through z. The following command line offers a second example:

    java RegexDemo [a-f&&[^a-c]&&[^e]] abcdefg


    java RegexDemo [a-f&&[^a-c]&&[^e]] abcdefg matches d and f with their counterparts in abcdefg. No other matches exist.

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