From b7a495f8d032e7c60f490a4a822f854707f02275 Mon Sep 17 00:00:00 2001
From: Filipp Gunbin <fgunbin@fastmail.fm>
Date: Sat, 10 Jul 2021 19:00:01 +0200
Subject: [PATCH] doc/lispref/text.texi (Substitution): Add
 subst-char-in-string

* doc/lispref/text.texi (Substitution): Document
subst-char-in-string (bug#49420).
---
 doc/lispref/text.texi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/doc/lispref/text.texi b/doc/lispref/text.texi
index 0c87a19fa14..71a8efe3622 100644
--- a/doc/lispref/text.texi
+++ b/doc/lispref/text.texi
@@ -4428,6 +4428,16 @@ ThXs Xs the contents of the buffer before.
 @end example
 @end defun
 
+
+@defun subst-char-in-string fromchar tochar string &optional inplace
+@cindex replace characters in string
+This function replaces all occurences of the character @var{fromchar}
+with @var{tochar} in @var{string}.  Unless @var{inplace} is non-nil,
+substitution occurs in a copy of @var{string}.  In any case, the
+function returns the resulting string.  Both characters must have the
+same multi-byte length.
+@end defun
+
 @deffn Command translate-region start end table
 This function applies a translation table to the characters in the
 buffer between positions @var{start} and @var{end}.
-- 
2.39.2