From 9855548a77af4a5da971bed0632d21a141b84616 Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Wed, 26 May 2004 10:03:33 +0000
Subject: [PATCH] Rob Landley writes:

add sed -r support.

I bumped into a couple of things that want to use extended regular expressions
in sed, and it really isn't that hard to add.  Can't say I've extensively
tested it, but it's small and isn't going to break anything that doesn't use
it, so...

Rob
---
 editors/sed.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/editors/sed.c b/editors/sed.c
index 45574e81d..3d6871621 100644
--- a/editors/sed.c
+++ b/editors/sed.c
@@ -112,7 +112,7 @@ typedef struct sed_cmd_s {
 
 /* globals */
 /* options */
-static int be_quiet = 0, in_place=0;
+static int be_quiet = 0, in_place=0, regex_type=0;
 FILE *nonstdout;
 char *outname;
 
@@ -298,7 +298,7 @@ static int get_address(char *my_str, int *linenum, regex_t ** regex)
 
 		temp=copy_parsing_slashn(pos,next);
 		*regex = (regex_t *) xmalloc(sizeof(regex_t));
-		xregcomp(*regex, temp, REG_NEWLINE);
+		xregcomp(*regex, temp, regex_type|REG_NEWLINE);
 		free(temp);
 		/* Move position to next character after last delimiter */
 		pos+=(next+1);
@@ -326,7 +326,7 @@ static int parse_file_cmd(sed_cmd_t * sed_cmd, const char *filecmdstr, char **re
 
 static int parse_subst_cmd(sed_cmd_t * const sed_cmd, char *substr)
 {
-	int cflags = 0;
+	int cflags = regex_type;
 	char *match;
 	int idx = 0;
 
@@ -1115,12 +1115,15 @@ extern int sed_main(int argc, char **argv)
 #endif
 
 	/* do normal option parsing */
-	while ((opt = getopt(argc, argv, "ine:f:")) > 0) {
+	while ((opt = getopt(argc, argv, "irne:f:")) > 0) {
 		switch (opt) {
 		case 'i':
 			in_place++;
 			atexit(cleanup_outname);
 			break;
+		case 'r':
+			regex_type|=REG_EXTENDED;
+			break;
 		case 'n':
 			be_quiet++;
 			break;