this is a variable of jquery holding some text :
var a = "<table><h1>SomeText</h1> ><source src=‘/files/majalis/Majlis%2021%20Oct%202014_Dunya%20ka%20hr%20Nuqan%20bardasht%20kr%20lekin%20deen%20ka%20chota%20nuqsan%20no%20karo.mp3’ type=‘audio/mpeg’> </table>"
now in the above variable , i want to read only src value of <source tag ... and hold in variable ..