| Operation |
Name |
Type |
Precedence |
Description |
| %dn |
TRG |
primary |
5 |
single character(%dn = %dn-n) |
| %dn-m |
TRG |
primary |
5 |
range of characters (n <= m) |
| %dx.y… |
TBS |
primary |
5 |
string of two or more characters |
| "abc" |
TLS |
primary |
5 |
case-insensitive string of zero or more ASCII characters |
| R |
RNM |
primary |
5 |
named group of operators |
| (E) |
none |
primary |
4 |
unnamed group of operators |
| [E] |
none |
primary |
4 |
optional group of operators |
| !E |
PRD |
unary |
3 |
not, syntactic predicate |
| &E |
PRD |
unary |
3 |
and, syntactic predicate |
| n*mE |
REP |
unary |
3 |
repetition (0 <= n <= m < ∞) |
| E1 |
CAT |
binary |
2 |
concatenation |
| E1 / E2 |
ALT |
binary |
1 |
prioritized-choice alternation |
