Cabletron Systems SSR-GLX19-02, User Manual

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Appendix C: Supported Regular Expressions
460 CoreWatch User’s Manual
• CoreWatch also supports all of the Perl5 extended regular expressions, which are
described in the following table:
Table 88. Supported Perl5 extended regular expressions
Expression Description
(?#text) An embedded comment that you enter if you want text to be
ignored.
(?:regexp) Groups items such as “()” without causing the group match to
be saved.
(?=regexp) A zero-width positive lookahead assertion.
Suppose you enter \w+(?=\s). CoreWatch then matches a
word followed by white space, without including white space
in the resulting match.
(?!regexp) A zero-width negative lookahead assertion.
Suppose you enter port(?!7) matches any occurrence of “port”
that is not followed by “7”. Because this is a zero-width
assertion, entering a(?!b)d will cause CoreWatch to match ad
because a is followed by a character that is not b (the d) and a d
follows the zero-width assertion.
(?imsx) Embedded pattern-match modifiers. You may enter one or
more of these modifiers.
i enables case insensitivity, m enables multiline treatment of
the input, s enables single line treatment of the input, and x
enables extended white space comments.