.maybe( value )

Description: Add a string to the expression that might appear once (or not).

Parameter	Description
String value	The string to be looked for

Example: The following matches all strings that begin with http:// or https:// and converts them to HTML links.

var my_paragraph = "Take a look at the link http://google.com and the secured version https://www.google.com";
var expression = VerEx()
                .find( "http" )
                .maybe( "s" )
                .then( "://" )
                .anythingBut( " " );

my_paragraph = expression.replace( my_paragraph, function(link) {
    return "<a href='"+link+"'>"+link+"</a>";
} );
 
/* Outputs:
Take a look at the link <a href='http://google.com'>http://google.com</a> and the secured version <a href='https://www.google.com'>https://www.google.com</a>
*/