Several built-in, infix operators allow testing for equality and inequality. For numbers, <, >, <=, >=, ==, and != are used. For strings, eq, neq, and like are used.
Like takes a regular expression as its second argument and returns true if it matches the string given as its first argument. Arguments to these operators can be any valid expression.
spicy = cheese like re/(nacho|pepperjack)/;
The following are all valid predicate expressions:
c == 5
page:var("city") eq "Blackfoot"
"Lindon" neq location:city()
weather:curr_temp() < 90
location:city() + ", WA" eq city
5 * (weather:curr_temp() - 32) / 9 < 0
As can be seen from the preceding examples, a number of built-in libraries provide predicates that can be used inside predicate expressions. The documentation for those libraries gives details about their operation.
Compound predicate expressions are created using the operators &&, ||, and not to express conjunction, disjunction, and negation, respectively. Parentheses are used to group expressions for precedence.
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