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regex->initialise
regex ->initialise: pattern=[char_array], case_sensitive=[bool], syntax=[{basic,extended,advanced}]
Create a regular expression from a pattern string. The regular expression will be regex->compile’d on the first call to regex->match or regex->search. After creation the pattern may be changed using regex->pattern.

If the case_sensitive argument is @off, searching and matching is caried out ignoring case. See also regex->ignore_case.

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