How It Works

The following table lists the special characters that you can use in regex rule expressions.

Convention Description
* Zero or more characters.
+ Zero or more repeated instances of the token preceding the +.
? Zero or one character.
\character Escaped character.
\? Match on a question mark (\<ctrl-v>?)
\+ Match on a plus sign
\* Match on an asterisk
\a Alert (ASCII 7)
\b Backspace (ASCII 8)
\f Form-feed (ASCII 12)
\n New line (ASCII 10)
\r Carriage return (ASCII 13)
\t Tab (ASCII 9)
\v Vertical tab (ASCII 11)
\0 Null (ASCII 0)
\\ Back slash
Bracketed range [0-9] Matching any single character from the range.
A leading ^ in a range No match in the range. All other characters represent themselves.
.\x## Any ASCII character as specified in two-digit hex notation. For example, \x5A yields a ‘Z’.

The following diagram illustrates the regex rule configuration through RCM: