From 418671fdb06c1920414056f9b47245aa062f7b6f Mon Sep 17 00:00:00 2001
From: Peter Stephenson <pws@users.sourceforge.net>
Date: Wed, 25 Mar 2009 11:29:11 +0000
Subject: Jon Strait: 26778, 26781: extra options for PCRE matching

---
 Doc/Zsh/mod_pcre.yo | 37 +++++++++++++++++++++++++++++++++++--
 1 file changed, 35 insertions(+), 2 deletions(-)

(limited to 'Doc')

diff --git a/Doc/Zsh/mod_pcre.yo b/Doc/Zsh/mod_pcre.yo
index 33b864478..9b8d9d6a7 100644
--- a/Doc/Zsh/mod_pcre.yo
+++ b/Doc/Zsh/mod_pcre.yo
@@ -6,7 +6,7 @@ The tt(zsh/pcre) module makes some commands available as builtins:
 
 startitem()
 findex(pcre_compile)
-item(tt(pcre_compile) [ tt(-aimx) ] var(PCRE))(
+item(tt(pcre_compile) [ tt(-aimxs) ] var(PCRE))(
 Compiles a perl-compatible regular expression.
 
 Option tt(-a) will force the pattern to be anchored.
@@ -15,6 +15,8 @@ Option tt(-m) will compile a multi-line pattern; that is,
 tt(^) and tt($) will match newlines within the pattern.
 Option tt(-x) will compile an extended pattern, wherein
 whitespace and tt(#) comments are ignored.
+Option tt(-s) makes the dot metacharacter match all characters,
+including those that indicate newline.
 )
 findex(pcre_study)
 item(tt(pcre_study))(
@@ -22,7 +24,8 @@ Studies the previously-compiled PCRE which may result in faster
 matching.
 )
 findex(pcre_match)
-item(tt(pcre_match) [ tt(-v) var(var) ] [ tt(-a) var(arr) ] var(string))(
+item(tt(pcre_match) [ tt(-v) var(var) ] [ tt(-a) var(arr) ] \
+[ tt(-n) var(offset) ] [ tt(-b) ] var(string))(
 Returns successfully if tt(string) matches the previously-compiled
 PCRE.
 
@@ -35,6 +38,36 @@ var(MATCH) will be set to the entire matched portion of the
 string, unless the tt(-v) option is given, in which case the variable
 var(var) will be set.
 No variables are altered if there is no successful match.
+A tt(-n) option starts searching for a match from the
+byte var(offset) position in var(string).  If the tt(-b) option is given,
+the variable var(ZPCRE_OP) will be set to an offset pair string,
+representing the byte offset positions of the entire matched portion
+within the var(string).  For example, a var(ZPCRE_OP) set to "32 45" indicates
+that the matched portion began on byte offset 32 and ended on byte offset 44.
+Here, byte offset position 45 is the position directly after the matched
+portion.  Keep in mind that the byte position isn't necessarily the same
+as the character position when UTF-8 characters are involved.
+Consequently, the byte offset positions are only to be relied on in the
+context of using them for subsequent searches on var(string), using an offset
+position as an argument to the tt(-n) option.  This is mostly
+used to implement the "find all non-overlapping matches" functionality.
+
+A simple example of "find all non-overlapping matches":
+
+example(
+string="The following zip codes: 78884 90210 99513"
+pcre_compile -m "\d{5}"
+accum=()
+pcre_match -b -- $string
+while [[ $? -eq 0 ]] do
+    b=($=ZPCRE_OP)
+    accum+=$MATCH
+    pcre_match -b -n $b[2] -- $string
+done
+print -l $accum
+
+
+)
 )
 enditem()
 
-- 
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