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: