Regular expression options
Regular expressions

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When Constructing regular expressions, various options can be provided. Options have single-character names. A string of options has one of the following two forms:

on on-off


The latter syntax allows some options to be disabled. The on and off strings name options to be enabled and disabled, respectively.

The following options are supported:
icase-insensitive
dunix-lines
mmultiline
sdotall
rreversed-regexp