Returns non-zero if u is a Unicode alpha character. (General Unicode category: Lu, Ll, Lt, Lm and Lo)
Returns non-zero if c is a Unicode lower case character.
Returns non-zero if c is a Unicode upper case character.
If c is a Unicode upper case character, return the lower case equivalent, otherwise return c.
If c is a Unicode lower case character, return the upper case equivalent, otherwise return c.
A sorted list of Unicode ranges that define valid UniAlpha characters.
Simple Unicode character classification functions. References: ASCII Table, Wikipedia, The Unicode Consortium Trademarks: Unicode™ is a trademark of Unicode, Inc.