I made the patch that implements regexp_replace again.

The specification of this function is as follows.

regexp_replace(source text, pattern text, replacement text, [flags
text])
returns text

Replace string that matches to regular expression in source text to
replacement text.

 - pattern is regular expression pattern.
 - replacement is replace string that can use '\1'-'\9', and '\&'.
    '\1'-'\9': back reference to the n'th subexpression.
    '\&'     : entire matched string.
 - flags can use the following values:
    g: global (replace all)
    i: ignore case
    When the flags is not specified, case sensitive, replace the first
    instance only.

Atsushi Ogawa

1 files changed, 6 insertions, 2 deletions

diff --git a/src/backend/regex/regexec.c b/src/backend/regex/regexec.c
index 808f894711..eb5807545e 100644
--- a/src/backend/regex/regexec.c
+++ b/src/backend/regex/regexec.c
@@ -110,6 +110,7 @@ struct vars
 	regmatch_t *pmatch;
 	rm_detail_t *details;
 	chr		   *start;			/* start of string */
+	chr		   *search_start;	/* search start of string */
 	chr		   *stop;			/* just past end of string */
 	int			err;			/* error code if any (0 none) */
 	regoff_t   *mem;			/* memory vector for backtracking */
@@ -168,6 +169,7 @@ int
 pg_regexec(regex_t *re,
 		   const chr *string,
 		   size_t len,
+		   size_t search_start,
 		   rm_detail_t *details,
 		   size_t nmatch,
 		   regmatch_t pmatch[],
@@ -219,6 +221,7 @@ pg_regexec(regex_t *re,
 		v->pmatch = pmatch;
 	v->details = details;
 	v->start = (chr *) string;
+	v->search_start = (chr *) string + search_start;
 	v->stop = (chr *) string + len;
 	v->err = 0;
 	if (backref)
@@ -288,7 +291,8 @@ find(struct vars * v,
 	NOERR();
 	MDEBUG(("\nsearch at %ld\n", LOFF(v->start)));
 	cold = NULL;
-	close = shortest(v, s, v->start, v->start, v->stop, &cold, (int *) NULL);
+	close = shortest(v, s, v->search_start, v->search_start, v->stop,
+					 &cold, (int *) NULL);
 	freedfa(s);
 	NOERR();
 	if (v->g->cflags & REG_EXPECT)
@@ -415,7 +419,7 @@ cfindloop(struct vars * v,
 
 	assert(d != NULL && s != NULL);
 	cold = NULL;
-	close = v->start;
+	close = v->search_start;
 	do
 	{
 		MDEBUG(("\ncsearch at %ld\n", LOFF(close)));