Add check for redundant whitespace alternations#52
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Flag patterns like (\n|\s+)+, (\n|\s)+ and (\s|\n)+ where an outer +/* repetition wraps a group whose alternation branches all match only whitespace subsumed by \s, with at least one branch being \s itself. Since \s already matches \n (and others), the alternation, group and outer quantifier are all redundant and the pattern simplifies to \s+. This is the anti-pattern cleaned up in pygments/pygments#3186. New checker 126 (check_redundant_whitespace_alternation), with tests.
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Flag patterns like (\n|\s+)+, (\n|\s)+ and (\s|\n)+ where an outer +/* repetition wraps a group whose alternation branches all match only whitespace subsumed by \s, with at least one branch being \s itself. Since \s already matches \n (and others), the alternation, group and outer quantifier are all redundant and the pattern simplifies to \s+.
This is the anti-pattern cleaned up in pygments/pygments#3186.
New checker 126 (check_redundant_whitespace_alternation), with tests.