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The zsh/regex module makes available the following test condition:
Matches a string against a POSIX extended regular expression. On successful match, matched portion of the string will normally be placed in the MATCH variable. If there are any capturing parentheses within the regex, then the match array variable will contain those. If the match is not successful, then the variables will not be altered.
For example,
[[ alphabetical -regex-match ^a([^a]+)a([^a]+)a ]] && print -l $MATCH X $match
If the option REMATCH_PCRE is not set, then the =~ operator will automatically load this module as needed and will invoke the -regex-match operator.
If BASH_REMATCH is set, then the array BASH_REMATCH will be set instead of MATCH and match.