Regular expression data. Requires a regular expres-
sion <STRONG>(char</STRONG> <STRONG>*)</STRONG> third argument; the data is valid if
the regular expression matches it. Regular expres-
- sions are in the format of <STRONG><A HREF="regcomp.3x.html">regcomp(3x)</A></STRONG> and
+ sions are in the format of <STRONG><A HREF="regcomp.3x.html">regcomp(3X)</A></STRONG> and
<STRONG><A HREF="regexec.3x.html">regexec(3X)</A></STRONG>. Please notice that the regular expres-
sion must match the whole field. If you have for
example an eight character wide field, a regular