| Perl-Compatible Regular Expressions (PCRE) |
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| Perl-Compatible Regular Expressions (PCRE) |
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Perl Compatible Regular Expressions (PCRE) are much more powerful than their POSIX counterpartsand consequently, also more complex and difficult to use.
PCRE adds its own character classes to the extended regular expression rules that we saw earlier:
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\w represents a "word" character and is equivalent to the expression [A-Za-z0-9].
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\W represents the opposite of \w and is equivalent to [^A-Za-z0-9].
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\s represents a whitespace character.
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\S represents a nonwhitespace character.
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\d represents a digit and is equivalent to [0-9].
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\D represents a nondigit character and is equivalent to [^0-9].
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\n represents a newline character.
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\r represents a return character.
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