Regular Expression: 0-9 A-Z a-z or any of these '!#$%&'*+-/=?^_`{|}~.

Question

Hi,

I need to regex string myString to only have:

• 0-9
• A-Z or a-z
• any of these characters '!#$%&'*+-/=?^_`{|}~.

This is my code line:

new Regex("[a-zA-Z0-9]").IsMatch(myString);

So far I have [a-zA-Z0-9] and this works fine for the first two listitems. Currently tearing my hair out (and it's so nice I want to keep it) over metacharacters and getting nowhere.

Any help would be greatly appreciated. Thanks. Dave

Answer 1

"[a-zA-Z0-9'!#$%&'*+/=?^_`{|}~.-]"

check that ("-") minus sign be the last char in a [] sequence

Answer 2

Meta characters are fine between brackets, as long as you escape the significant ones. Moreover the dash MUST be the last one of your sequence.

new Regex("[a-zA-Z0-9'!#$%&'*+/=?^_`{|}~-]").IsMatch(myString);

Answer 3

Try:

var re = "[a-zA-Z0-9" +  Regex.Escape("'!#$%&'*+-/=?^_`{|}~.") + "]";

Answer 4

Hi there If you want only the listed characters in your string it is very simple.but you need to match beginning an end of line

new Regex("^[a-zA-Z0-9'!#$%&'*+/=?^_`{|}~.-]*$").IsMatch(myString);