Validating the string for not starting with number in asp.net mvc

Question

I'm trying to validate the variable name where it should not start with number but can include numbers

[RegularExpression(@"^[A-Z0-9_]+$", ErrorMessage = "Only Alphanumeric characters and Underscore ('_') is allowed. All letters must be in Upper Case.")]

The above expression doesn't restrict the starting string with Number.

Use: ^[^0-9]\w*$

Tim Biegeleisen
– Tim Biegeleisen

2021-07-12 03:33:40 +00:00
Commented Jul 12, 2021 at 3:33 — Tim Biegeleisen
– Tim Biegeleisen, Commented Jul 12, 2021 at 3:33

Harshil Kansagara · Accepted Answer · 2021-07-12 03:39:15Z

1

Try this regular expression for validating a string which is not starting with a number.

[A-Z_][A-Z0-9_]*

answered Jul 12, 2021 at 3:39

Harshil Kansagara

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Daksharaj kamal · Accepted Answer · 2021-07-12 03:44:42Z

1

Try using this regular expression for validating a string that doesn't start with a number, but can contain a number

^[^0-9]\w*$

and you can always use this website for testing can modifying your RegEx

https://regexr.com/

answered Jul 12, 2021 at 3:44

Daksharaj kamal

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Sagar Pathak · Accepted Answer · 2021-07-12 03:58:07Z

1

This is the right answer, It will prompt error if string starts with a number.

^(?!^[0-9].*$).*

Thanks

answered Jul 12, 2021 at 3:58

Sagar Pathak

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