diff --git a/man7/regex.7 b/man7/regex.7
index 824a7ce89..201dfb174 100644
--- a/man7/regex.7
+++ b/man7/regex.7
@@ -40,15 +40,15 @@ Regular expressions (``RE''s),
 as defined in POSIX.2, come in two forms:
 modern REs (roughly those of
 .IR egrep ;
-1003.2 calls these ``extended'' REs)
+POSIX.2 calls these ``extended'' REs)
 and obsolete REs (roughly those of
 .BR ed (1);
-1003.2 ``basic'' REs).
+POSIX.2 ``basic'' REs).
 Obsolete REs mostly exist for backward compatibility in some old programs;
 they will be discussed at the end.
-1003.2 leaves some aspects of RE syntax and semantics open;
+POSIX.2 leaves some aspects of RE syntax and semantics open;
 `\*(dg' marks decisions on these aspects that
-may not be fully portable to other 1003.2 implementations.
+may not be fully portable to other POSIX.2 implementations.
 .PP
 A (modern) RE is one\*(dg or more non-empty\*(dg \fIbranches\fR,
 separated by `|'.
@@ -248,7 +248,7 @@ POSIX.2, section 2.8 (Regular Expression Notation).
 .SH BUGS
 Having two kinds of REs is a botch.
 .PP
-The current 1003.2 spec says that `)' is an ordinary character in
+The current POSIX.2 spec says that `)' is an ordinary character in
 the absence of an unmatched `(';
 this was an unintentional result of a wording error,
 and change is likely.
@@ -261,7 +261,7 @@ They are also somewhat vaguely defined
 `a\e(\e(b\e)*\e2\e)*d' match `abbbd'?).
 Avoid using them.
 .PP
-1003.2's specification of case-independent matching is vague.
+POSIX.2's specification of case-independent matching is vague.
 The ``one case implies all cases'' definition given above
 is current consensus among implementors as to the right interpretation.
 .PP