Returns a copy of a given string with everything but its letters removed.

string_letters(str)

Returns: string

With this function you can remove all characters that are not classed as letters. This is handy for preventing people from entering unwanted characters into a text entry (like entering "#" to force a new line).

Note: This function only detects the 26 letter english alphabet from A - Z.

username = string_letters(username); 

The above code will set the "username" variable to only hold the letter characters of the original string.

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