regular expression and date validation ( 5 Views )

1. hey, i have a question about regular expressions and date validation:
   it references thread id # 95177 i think
   i have a date field and need to validate the format is mm/yyyy. i am using code from that thread, but it always brings back a false result saying the date format is wrong even if it is not. is the js code good for only netscape. i am using ie 5.0. can anyone solve this simple problem?
   
   <td nowrap><!--- onChange ="validDate();" --->
   <input type="text" name="pack_date#get_mdc_SCR_lines.transx_nbr#" value="<cfif #IsDate(pack_date)#>#dateformat(PACK_DATE, "mm/yyyy")#<cfelse>#get_mdc_SCR_lines.pack_date#</cfif>" size="11" maxlength="11" onChange ="return validDate(this.value);">
   </td>
   
   <script>
   function validDate(theDate) {
   //var theDate = #dateformat(PACK_DATE, "mm/yyyy")#;
   alert(theDate);
   var re_date = new RegExp("^\d{1,2}\/\d{4}$");
   alert(re_date);
   var isValid = re_date.test(theDate);
   alert(isValid);
   if (!isValid) { alert("Please enter the date in the correct MM/YYYY format." );
   }
   return isValid;
   }
   </script>
   
   thanks
   dan
   
   
   (burcak , Colombia)


2. Are you sure that the date is being properly formatted by ColdFusion before inserting it in your script? I can't see anything else off the top of my head that would cause that script to fail.
   
   

   Edit:
   
   
   Fixed the script you were referring to in that thread. Here's the new version :)
   

   Code:

   ---

   <script type="text/javascript">
function validDate(theDate) {
var re_date = new RegExp("^[0-9]{1,2}\/[0-9]{1,2}\/[0-9]{4}$");
var isValid = re_date.test(theDate);
if (!isValid) {
        alert("Please enter the date in the correct DD/MM/YYYY format.");
}
return isValid;
}
</script>

   ---

   
   
   (dilek, Japan)


3. When creating patterns as strings (ie using the RegExp constructor) you need to escape your backslashes -- because in a string context they are there to escape the proceeding character, and aren't really in the string at all.
   
   var re_date = new RegExp("^\\d{1,2}\\/\\d{4}$" );
   
   That should do it. Or, you can just use a pattern literal
   
   var re_date = /^\d{1,2}\/\d{4}$/;
   
   
   (mustafa , Zambia)


4. thanks that helped
   
   
   (gülseren, Italy)

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