Restricted User Shell
regex statement configures the flavor of regular
expressions for use by subsequent
Configure the type of regular expressions.
Regex-flags is a whitespace-separated list of flags. Each flag is a word specifying some regular expression feature. It can be preceded by ‘+’ to enable this feature (this is the default), or by ‘-’ to disable it. Valid flags are:
Use POSIX Extended Regular Expression syntax when interpreting regex. This is the default.
Use basic regular expressions. Equivalent to ‘-extended’.
Do not differentiate case. Subsequent regex matches will be case insensitive.
For example, the following statement enables POSIX extended, case insensitive matching:
regex +extended +icase
regex settings affect subsequent
match statements (see Conditions), and remain in effect
regex statement or the end of configuration file,
whichever occurs first.
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