Coyote Point Systems E350GX, Installation And Administration Manual

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Regular Expressions in Match Rules and Responders
Equalizer Installation and Administration Guide 275
Escape Sequences
The following escape character sequences match the indicated characters:
Matching Expressions
If a real expression could match more than one substring of a given string, the real expression matches the one
starting earliest in the string. If the real expression could match more than one substring starting at that point, it
matches the longest. Subexpressions also match the longest possible substrings, subject to the constraint that the
whole match be as long as possible, with subexpressions starting earlier in the real expression taking priority over
ones starting later. Note that higher-level subexpressions thus take priority over their lower-level component
subexpressions.
Match lengths are measured in characters, not collating elements. A null string is considered longer than no match at
all. For example, 'bb*' matches the three middle characters of 'abbbc', '(wee|week)(knights|nights)' matches all ten
characters of 'weeknights', when '(.*).*' is matched against 'abc' the parenthesized subexpression matches all three
characters, and when '(a*)*' is matched against 'bc' both the whole real expression and the parenthesized
subexpression match the null string.
\\ matches a single backslash ( \ )
\b matches the beginning of a word (e.g.:
\bex
matches ‘
example
’ but not ‘
text
’)
\n, \r, \t, \v match whitespace characters
\', \" match single and double quotes