Question

I need a regular expression to check a string should contain only letters and space.No other character other than letter [A-Z] and space are allowed.
Please help.

Answer 1

The complete regex looks like this

^[A-Z ]+$

You can simply create a character class and put the characters in that you want to allow:

[A-Z ]

if you want to allow also lower case letters then use

[A-Za-z ]

or use the i (IgnoreCase) option

So your character class matches 1 character. you want to repeat it to match more than one character.

+ would be at least one character, where

* would additionally match 0 characters

As last step you need to ensure that the complete string is matched, you can do this using anchors.

^ matches the beginning of the string

$ matches the end of the string (or a newline if you use the m (multiline) option