-Regular expression data. Requires a regular expression \fB(char *)\fR third argument;
-the data is valid if the regular expression matches it. Regular expressions
-are in the format of \fBregcomp\fR and \fBregexec\fR. Please notice
-that the regular expression must match the whole field. If you have for
-example an eight character wide field, a regular expression "^[0-9]*$" always
-means that you have to fill all eight positions with digits. If you want to
-allow fewer digits, you may use for example "^[0-9]* *$" which is good for
-trailing spaces (up to an empty field), or "^ *[0-9]* *$" which is good for
+Regular expression data.
+Requires a regular expression \fB(char *)\fR third argument.
+The data is valid if the regular expression matches it.
+.IP
+Regular expressions
+are in the format of \fBregcomp\fR and \fBregexec\fR.
+.IP
+The regular expression must match the whole field.
+If you have for example, an eight character wide field,
+a regular expression "^[0\-9]*$" always
+means that you have to fill all eight positions with digits.
+If you want to allow fewer digits,
+you may use for example "^[0\-9]* *$" which is good for
+trailing spaces (up to an empty field),
+or "^ *[0\-9]* *$" which is good for