RegEx that doesnt allow tilde / console key

Question

I have the following regex

(^[a-zA-z]+([a-zA-Z\\s-]*)[a-zA-z]+$)

It disallow all special chars except ( ` ) the console key. Could someone expl

Answer 1

Do not use [A-z], use [a-zA-Z]:

^[a-zA-Z]+([a-zA-Z\s-]*)[a-zA-Z]+$

Otherwise, the [A-z] class will match some other non-letter symbols, too:

Here is a demo on regex101.com.

Just a note: [A-z] can sometimes be used to match all letters in POSIX-style regex when collation is set for a particular language.

[[ "ABCEDEF[]_abcdef" =~ ([A-z]+) ]] && echo "${BASH_REMATCH[1]}" on Cygwin with LC_COLLATE="en_US.UTF-8" yields ABCEDF. If you set LC_COLLATE to C (on Cygwin, done with export), it will give the expected ABCEDEF[]_abcdef.