正则表达式，以避免特殊字符，并且不应以数字开头

Question

What regular expression can I use to not allow special characters and make certain it does not begin with numbers.

I'm using /[^a-zA-Z0-9]/ which is filtering out special characters. How can I make sure it does not start with numbers in regex itself.

Also i'm using ng-pattern of angular with my input box.

Answer 1

/^[a-zA-Z][a-zA-Z0-9]*$/

This should do it.

Try this if you want to have one or two words.

^[a-zA-Z][a-zA-Z0-9]*(?:\s+[a-zA-Z][a-zA-Z0-9]+)?$

Answer 2

This should work for you

^[^\W0-9_][^\W_]+$

If Spaces are permitted

^[^\W0-9_][a-zA-Z0-9\s]+$

If you're not trying to match the whole string, you can remove ^ and $ which match start and end respectively.

Answer 3

You can just use this regex:

/^[a-zA-Z]/

to make sure your input is only starting with a letter (non-digit and non-special character).