From 20c1f1aec6f29a87d738897f80242c6dff4c808b Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Sun, 24 Nov 2019 18:37:23 +0000
Subject: [PATCH] Only substitute patterns starting with ^ once.

---
 regsub.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/regsub.c b/regsub.c
index 89355bef..199b2171 100644
--- a/regsub.c
+++ b/regsub.c
@@ -107,6 +107,12 @@ regsub(const char *pattern, const char *with, const char *text, int flags)
 			start = m[0].rm_eo + 1;
 			empty = 1;
 		}
+
+		/* Stop now if anchored to start. */
+		if (*pattern == '^') {
+			regsub_copy(&buf, &len, text, start, end);
+			break;
+		}
 	}
 	buf[len] = '\0';