Using the substring function to parse out NPA-NXX of phone numbers in records, where sometimes the phone number starts with a "1" (11 characters/digits in length), and sometimes they don't (10 characters/digits in length). Using the following syntax to 1) print my original field and 2) print a substr, starting 10 characters from the END of a the string (negative index), and parse out 6 characters (and even filtering out ONLY for records where there are only 11 characters):

if(length($11)==11){print $11, (substr($11,-10,6))

But the results I get have the results starting from the very first characters in the string:

15556667777 155566

I am not sure what I am doing wrong?

In reply to Negative Index with "substr" Not Working by he204035

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