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CoreWatch User’s Manual 459
Appendix C: Supported Regular Expressions
• CoreWatch matches expressions within parentheses as subpattern groups and uses
certain methods to save those matches.
By default, a quantified subpattern matches as many times as possible without causing
the rest of the pattern not to match. If you want the quantifiers to match the minimum
number of times possible, without causing the rest of the pattern not to match, insert a
question mark (?) after the quantifier as described in the following table:
\cD Matches the corresponding control character
\nn or \nnn Octal representation of character unless a back-reference.
\1, \2, \3,
and so on A back-reference, which matches whatever the first, second, third, and
so on parenthesized group matched. If there is no corresponding
group, the number is interpreted as an octal representation of a
character.
\0 Matches the null character
Table 87. Supported quantifier subpattern matching
Expression Description
*? Match 0 or more times
+? Match 1 or more times
?? Match 0 or 1 time
{n}? Match exactly n times
{n,}? Match at least n times
{n,m}? Match at least n times but not more than m times
Table 86. Supported special (backslashed) characters (Continued)
Character Description