Supported Regular Expression Characters
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LogLogic LMI support the following regular expression meta characters, based on Java regular expressions:
| Characters | Description |
|---|---|
| \a | Matches ASCII character code 0x07. |
| \d | Matches character in the set "0123456789". |
| \D | Matches any byte not in the set "0123456789". |
| \e | The escape character. Matches ASCII character code 0x1b. |
| \f | The form-feed character. Matches ASCII character code 0x0c. |
| \n | The new line (line feed) character. Matches ASCII character code 0x0a. |
| \r | The carriage return character. Matches ASCII character code 0x0d. |
| \s | A white space. Matches white space - \t \n 0x0b \f or \r. |
| \S | A non-white space. Matches any byte not in \s. |
| \t | The tab character. Matches any byte not in 0x09. |
| \w | A word character. Matches any ASCII character in the set underscore, digits, or upper or lower case letter. |
| \W | A non-word character. Matches any bytes not in \w. |
| \xHH | Matches a byte specified by the hex code HH. There must be exactly two characters after the \x. |
| \Q | Starts a quoted region. All meta characters lose their meaning until \E. A \\ can be used to put a backlash into the region. |
| \anything else | Matches the next character. |
| \k<name> | Refers to previous named capture. |
| [] | Specifies a character class - match anything inside the brackets. A leading ^ negates the sense of the class - match anything not inside the brackets. Negated character classes are computed from the set of code in the range 0-127 - in other words no bytes with the high bit set. Within a character class the following backslash characters mean the same thing as outside the character class: \a, \d, \D, \e, \f, \n, \r, \s, \S, \t, \w, \W, and \xHH. |
| {num} or {num:num} | Specifies a repetition count for the previous regular expression. Num must be less than 16. {num} is equivalent to {0:num}. |
| . | Matches any byte: 0x00 - 0xFF. |
| + | Specifies that the previous regular expression is repeated 1 or more times. |
| * | Specifies that the previous regular expression is repeated zero or more times. |
| ( ) (?:) | Specifies capturing or non-capturing groups. |
| (?<name>) | Specifies capturing named groups. |
| | | Specifies alternation. |
| ? | Specifies that the previous regular expression is repeated zero or one time. |
| anything else | Any other character matches itself. |