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Wildcards

Another special case of a word is a wildcard.

<wildcard>:==

{ | | | + | <string> }

: matches any string.
: matches a single character.
: matches any number.
: + matches any digit.

It is used to match a construct against sets of other words. The possibility of a wildcard specification is also indicated by enclosing syntactic constructs in <* *> angle brackets.

Example

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