This can match up to 10 nested parentheses.

needs to be modified for use in python by this code example note use of {3 } and additional parenthesis around the import re nigeRegex = re.compile(r'((\d{3}-)?\d{3}-\d{4}(,)?){3}') nigeRegex.search('My numbers are 415-555-1234,555-4242,212-555-0000')

needs to be modified for use in python by this code example note use of {3 } and additional parenthesis around the import re nigeRegex = re.compile(r'((\d{3}-)?\d{3}-\d{4}(,)?){3}') nigeRegex.search('My numbers are 415-555-1234,555-4242,212-555-0000')

Taken from Regex DB

Determines if a company's Unique Entity Number is local (Singapore) for ESG FN

Czech PSČ regexp