file: jobb.t package: muf status: alpha
(This is a low-level primitive used internally by the MUQ MUF
regular expression implementation: It will not normally be of interest
to users unless they are writing another regular expression implemention
for Muq.)
Try to match a char class. Input string looks like "^a-zA-Z" if surface
syntax was "[^a-zA-z]". Return value is nil if match failed,
otherwise cursor is advanced one char.
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