# [Special] alternatives
REG_ANY REG_ANY, no Match any one character (except newline).
SANY REG_ANY, no Match any one character.
+CANY REG_ANY, no Match any one byte.
ANYOF ANYOF, sv Match character in (or not in) this class.
ALNUM ALNUM, no Match any alphanumeric character
ALNUML ALNUM, no Match any alphanumeric char in locale