New in version 2.0.
True when expr is a chromatic pitch-class name. Otherwise false:
abjad> pitchtools.is_chromatic_pitch_class_name('fs') True
The regex ^([a-g,A-G])(([s]{1,2}|[f]{1,2}|t?q?[fs]|)!?)$ underlies this predicate.
Return boolean.
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