书面模式与字符串 Javascript/jQuery 不匹配

Question

I'm validating text field for following data pattern "I-MH-ABCD-ABC-1222";

Following is a RegEx I've written and it is not working.

var router_added_sap = "I-MH-ABCD-ABC-1222";
var pattern = /^[a-zA-Z]{1}\-[a-zA-Z]{2}\-[a-zA-Z]{4}\-[a-zA-Z]{3}\-\d/;

if(!router_added_sap.match(pattern))
{
   alert("Please Enter Right SAP-IDasa");
   return false;
}

Though user write correct pattern script is giving me an alert message.

Answer 1

Definitely no need to escape the dashes. You also need to group each of these together. If these are being used in a single field by itself then I would recommend making sure to check for the start of the string (^) and the end of the string ($) and apply the ignore case flag at the end (i). The (+) just at the end is a quantifier that will check for 1 or more digits and grab all of them. So I would rewrite it as such.

var router_added_sap = "K-MH-ABCD-ABC-1222";
var pattern = /^([A-Z]{1})-([A-Z]{2})-([A-Z]{4})-([A-Z]{3})-\d+$/i;

if(!router_added_sap.match(pattern))
{
   alert("Please Enter Right SAP-IDasa");
   return false;

}

http://www.regexr.com/ is great for helping build Regular Expressions. I also keep a great cheat sheet printed off on my desk that I found here: http://cheatography.com/1/cs/5/