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.)
Match any of the usual C isspace() characters: space, tab,
linefeed, return.
Return value is nil if match failed, else cursor advances one.
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