Validation to check UserID with Period/Dot seperated

Regular Expression Rules:

Finite automata rule, Values should precede with characters of set [A-Za-z] and followed with period(.) and character set [A-Za-z]

Regular Expression:



1) Ratan.Tata
2) Anil.Dhiru.Ambhani


1) .Mukesh.
2) Amir.khan.

Regular Expression Logic in Javasctipt


function CheckForPeriodSeperatedUserID( fieldValue )
var regex = /^[a-zA-Z]+(\.[a-zA-Z]+)+$/;
if( !fieldValue.match( regex ) )
alert('The UserID is not desired format,XXX.YYYY XXX.YYYY.ZZZZ');
return false;
return true;


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