| Expression | Description |
| RS | R followed by S (concatenation) |
| R|S | Either R or S |
| R/S | An R but only if it is followed by S |
| (R) | Grouping R |
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| Expression | Description |
| RS | R followed by S (concatenation) |
| R|S | Either R or S |
| R/S | An R but only if it is followed by S |
| (R) | Grouping R |