Need Help in modifying the regex

[SAS21]

Was trying to modify the following regex to accept the alphabets (caps and small) with/without spaces allowed at the front of the card number and at the back of the card number but its not working

Initial regex   /\b27(?:[ \t-]*\d){13}\b/g;   trying to modify this to accept the alphabets in case if the user enters by mistake an alphabet in front/at the end of the card number.

Modified Regex  /\b([A-Za-z]+)27(?:[ \t- ]*\d){13}([A-Za-z ]+)\b/g;   but this is not working.

Appreciate the Help

[Mark Manders]

Will this work: /\b[A-Za-z\s]*27(?:[ \t-]*\d){13}[A-Za-z\s]*\b/g

[SAS21]

its working thank you...another question for the same sceanrio. is it possible to replace only the alphabet that is before the card number  instead of replacing all the text

trying with this -match.replace(/[-\sA-Za-z]/g, '').replace(/^(\d{4})/, 'XXXX');

Input - Test Data A2765 071006 71992 

 with the above script its removing all the ( text)  and giving o/p as  XXXX07100671992 

Required o/p should be Test Data AXXXX07100671992 . Is it possible to replace only the first alphabet if the card number has any before or end ?