[PATCH] fnmatch.3: Describe the FNM_EXTMATCH flag and pattern syntax

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Signed-off-by: Pádraig Brady <P@xxxxxxxxxxxxxx>
---
 man3/fnmatch.3 | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/man3/fnmatch.3 b/man3/fnmatch.3
index a7c55ff..3502e06 100644
--- a/man3/fnmatch.3
+++ b/man3/fnmatch.3
@@ -86,6 +86,32 @@ use of glibc and is implemented only in certain cases.
 .B FNM_CASEFOLD
 If this flag (a GNU extension) is set, the pattern is matched
 case-insensitively.
+.TP
+.B FNM_EXTMATCH
+If this flag (a GNU extension) is set, extended patterns are
+supported, as introduced by \&'ksh' and now supported by other shells.
+The extended format is as follows, with \fIpattern\-list\fR
+being a \&'|' separated list of patterns.
+.TP
+\&'?(\fIpattern\-list\fR)'
+The pattern matches if zero or one occurrences of any of the
+patterns in the \fIpattern\-list\fR match the input \fIstring\fR.
+.TP
+\&'*(\fIpattern\-list\fR)'
+The pattern matches if zero or more occurrences of any of the
+patterns in the \fIpattern\-list\fR match the input \fIstring\fR.
+.TP
+\&'+(\fIpattern\-list\fR)'
+The pattern matches if one or more occurrences of any of the
+patterns in the \fIpattern\-list\fR match the input \fIstring\fR.
+.TP
+\&'@(\fIpattern\-list\fR)'
+The pattern matches if exactly one occurrence of any of the
+patterns in the \fIpattern\-list\fR match the input \fIstring\fR.
+.TP
+\&'!(\fIpattern\-list\fR)'
+The pattern matches if the input \fIstring\fR cannot be matched with
+any of the patterns in the \fIpattern\-list\fR.
 .SH RETURN VALUE
 Zero if
 .I string
-- 
2.5.0

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