zsh/Doc/Zsh/mod_pcre.yo

COMMENT(!MOD!zsh/pcre
Interface to the PCRE library.
!MOD!)
cindex(regular expressions, perl-compatible)
The tt(zsh/pcre) module makes some commands available as builtins:

startitem()
findex(pcre_compile)
item(tt(pcre_compile) [ tt(-aimx) ] var(PCRE))(
Compiles a perl-compatible regular expression.
)
findex(pcre_study)
item(tt(pcre_study))(
Studies the previously-compiled PCRE which may result in faster
matching.
)
findex(pcre_match)
item(tt(pcre_match) [ tt(-a) var(arr) ] var(string))(
Returns successfully if tt(string) matches the previously-compiled
PCRE.

If the expression captures substrings within parentheses,
tt(pcre_match) will set the array var($match) to those
substrings, unless the tt(-a) option is given, in which
case it will set the array var(arr).
)
enditem()