^(?=\d{10})[1]\d{1,9}|^\d{1,9}
^ = startting string
(?=\d{10}) = check the string size is 10 or not
Ref :
- https://www.regextester.com/96826
- https://www.rexegg.com/regex-quickstart.html
Monday, February 17, 2020
Regular expression
^(?=\d{10})[1]\d{1,9}|^\d{1,9}
^ = startting string
(?=\d{10}) = check the string size is 10 or not
Ref :
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