Checking the existane of a particular character in an array of strings <p>i have an array of strings say for example @"123",@"373",@"221",@"921" .I need to check in how many elements of that array 2 exists and want to concatenate those elements into a mutable string and finally eradicate all two and prepare a string.I should have a string 13373191 out of the above example</p>