Detect upper case characters (Unicode category Lu)

Detect lower case characters (Unicode category Ll)

Detect letters (Unicode categories Lu, Ll, Lt, Lm, Lo)

Detect letters or digits (Unicode categories Lu, Ll, Lt, Lm, Lo, Nd, Nl, No)

Detect digits (Unicode categories Nd, Nl, No)

A category as defined by the Unicode standard.

Get the Unicode category. Warning: this function is very big. You should usually use one of the isXXX ones instead.

Parses a category name (Lu, Ll, Lt, ...).

Convert a category to its short category name (Lu, Ll, Lt, ...)

Converts a category to its English description. Mostly useful for debugging purposes.