ziishaned
3/28/2018 - 1:17 PM
Meta Characters
Meta Characters
| Meta character | Description |
|---|---|
| . | Period matches any single character except a line break. |
| Character class. Matches any character contained between the square brackets. | |
| [ | Negated character class. Matches any character that is not contained between the square brackets |
| * | Matches 0 or more repetitions of the preceding symbol. |
| + | Matches 1 or more repetitions of the preceding symbol. |
| ? | Makes the preceding symbol optional. |
| {n,m} | Braces. Matches at least "n" but not more than "m" repetitions of the preceding symbol. |
| (xyz) | Character group. Matches the characters xyz in that exact order. |
| | | Alternation. Matches either the characters before or the characters after the symbol. |
| \ | Escapes the next character. This allows you to match reserved characters [ ] ( ) { } . * + ? ^ $ \ | |
| ^ | Matches the beginning of the input. |
| $ | Matches the end of the input. |