Prefix the characters in the Charlist list with a backslash, and return the string with the backslash. It escapes \ r et cetera, in c-like style, the ASCII code below 32 and above 126 is converted to octal notation. When escaping an alphanumeric character, you can specify a range in the parameter charlist, such as "\0..\37", which escapes any character between ASCII code 0 and 31.
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