Something like [on¦off¦error] is enough, for that simple case. &nbsp;;)<br><br>----- Reply message -----<br>Da: &quot;Soumen&quot; &lt;soumen78@gmail.com&gt;<br>Data: mer, feb 17, 2010 11:58<br>Oggetto: [Boost-users] [program_options][1.35] validating string value<br>A: &lt;boost-users@lists.boost.org&gt;<br><br><br><br><br>Using regex can help you, maybe?<br><br>Say, my switch name is &quot;semantic_check&quot; and possible values are &quot;on&quot; (turns<br>on the checker, issues warning when something fails), &quot;off&quot; and &quot;error&quot;<br>(changes severity of warning to error). Could you cite an example code<br>snippet me how regex may help?<br><br>Regards,<br>~ Soumen<br>-- <br>View this message in context: <a href="http://old.nabble.com/-program_options--1.35--validating-string-value-tp27621865p27622050.html">http://old.nabble.com/-program_options--1.35--validating-string-value-tp27621865p27622050.html</a><br>Sent from the Boost - Users mailing list archive at Nabble.com.<br><br>_______________________________________________<br>Boost-users mailing list<br>Boost-users@lists.boost.org<br><a href="http://lists.boost.org/mailman/listinfo.cgi/boost-users">http://lists.boost.org/mailman/listinfo.cgi/boost-users</a><br><br><br>