| name | regex | op | kfl |
| - | - | - | - |
| concat | ab | a & b | and { a b } |
| alternation | a\|b | a \| b | or { a b } |
| kleen star | a* | [a] | star { a }
| optional | a? | a? | opt { a } |
| repetition | a{n,m} | a * (n..m) | rep n m { a } |
| class | [a-z] | 'a'..'z' | range a z |
| negation | [^a-z] | not { range { a z } } |
TODO