Check a javascript variable matches a substring using regex expression

I have a JavaScript variable that contains string value. I want to check whether the string contains UID_PK in it. How can I match t开发者_如何学Gohis string to match the substring "UID_PK" using regex expression?

For example var id="UID_PK:1234"

No regular expressions needed, you can use indexOf ^[docs]:

if(id.indexOf("UID_PK") > -1) {
    // id contains "UID_PK"
}

var id="UID_PK:1234"
if( id.match( /UID_PK/ )) alert( 'match' );

next time try to read dome documentation on regex in javascript , this is the most simple example