HRE
Regexp dialect for Hangulize
^- the beginning of word not line$- the end of word not line^^- the beginning of line (^in the standard)$$- the end of line ($in the standard)cat{dog}- "cat" before "dog" (positive lookahead){dog}cat- "cat" after "dog" (positive lookbehind)cat{~dog}- "cat" before not "dog" (negative lookahead){~dog}cat- "cat" after not "dog" (negative lookbehind)<var>- one of letters in the variable "var"