| Any character | * | `"c"*"t"` allows words like cat, cot, etc. |
| Letter | C | `C"ot"` allows words like Rot, pot, cot, Dot, mot, etc. |
| Uppercase letter | A | `A"ot"` allows words like Rot, Cot, Mot, Dot, etc. |
| Lowercase letter | a | `a"ot"` allows words like rot, cot, mot, dot, etc. |
| Letter or number | X | `X` allows any standalone number or letter. |
| Number | N | `N"th"` allows words like 5th, 4th, 6th, etc. |
| String | " " | `"cot"` |
| Or | | | `"pl"("o"|"a")"t"` allows "plot" and "plat". |
| Character from group | [] | `[tm]"ot"` allows "tot" and "mot". |
| Character not from group | [^] | `[^t]"ot"` allows "cot", "lot", etc., but not "tot". |
| Space (within group) | \s | `[A\s]` allows only the letter A or a space. |
| Any number of repetitions | {-} | `[AB74]{-}` allows any combination of A, B, 7, 4 of any length. |
| Exactly n repetitions | {n} | `N{2}"th"` allows 25th, 84th, 11th, etc. |
| From n to m repetitions | {n-m} | `N{1-3}"th"` allows 5th, 84th, 111th, etc. |
| From 0 to n repetitions | {-n} | `N{-2}"th"` allows 84th, 5th, etc. |
| n or more repetitions | {n-} | `N{2-}"th"` allows 25th, 834th, 311th, 34576th, etc. |
| Subexpression | () | — |
| Hyphen symbol | [\-] | — |
| Slash symbol | [\\] | — |
