This matcher always succeeds
This matcher accepts only ASCII whitespace characters,
and is always anchored, i.e. it will never match input
that starts with a non-ASCII whitespace character.
This matcher is used to match a single regular expression
This is a combination, jack-of-all trades matcher, which is
executes a set of smaller matches to form a large one. Some
parts of the “pattern” are known statically, while others
rely on runtime variable bindings and expression evaluation,
hence “smart”. This is the default matcher that is used any
time match blocks or substitutions are present in a pattern.
This matcher searches for a given substring in the input buffer,
with some control over how the search is conducted.
This matcher is a variation on [SubstringMatcher] that searches
for a match of any of multiple substrings in the input buffer.