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I want to write a regular expression for a standard US type phone number that supports the following formats:
###-###-#### (###) ###-#### ### ### #### ###.###.#### where # means any number. So far I came up with the following expressions
^[1-9]\d{2}-\d{3}-\d{4} ^\(\d{3}\)\s\d{3}-\d{4} ^[1-9]\d{2}\s\d{3}\s\d{4} ^[1-9]\d{2}\.\d{3}\.\d{4} respectively. I am not quite sure if the last one is correct for the dotted check. I also want to know if there is any way I could write a single expression instead of the 4 different ones that cater to the different formats I mentioned. If so, I am not sure how do I do that. And also how do I modify the expression/expressions so that I can also include a condition to support the area code as optional component. Something like
+1 ### ### #### where +1 is the area code and it is optional.
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Using a Regular Expression, we can validate a TextBox with 10 digit mobile number in C#. When asking a user to enter a mobile number, we usually validate if a number has 10 digits or not. If not, we ask user to enter full mobile number. In this case, I've a TextBox control on an ASP.NET Form.
+: one or more ( 1+ ), e.g., [0-9]+ matches one or more digits such as '123' , '000' . *: zero or more ( 0+ ), e.g., [0-9]* matches zero or more digits. It accepts all those in [0-9]+ plus the empty string.
^(\+\d{1,2}\s)?\(?\d{3}\)?[\s.-]\d{3}[\s.-]\d{4}$ Matches the following
123-456-7890 (123) 456-7890 123 456 7890 123.456.7890 +91 (123) 456-7890 If you do not want a match on non-US numbers use
^(\+0?1\s)?\(?\d{3}\)?[\s.-]\d{3}[\s.-]\d{4}$ Update :
As noticed by user Simon Weaver below, if you are also interested in matching on unformatted numbers just make the separator character class optional as [\s.-]?
^(\+\d{1,2}\s)?\(?\d{3}\)?[\s.-]?\d{3}[\s.-]?\d{4}$ If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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