add support for eight-value hex colors - closes #341

Author: MohammadYounes

lib/util.js

@@ -20,7 +20,7 @@ const REGEX_COMMENT = /\/\*[^]*?\*\//igm // non-greedy
 const REGEX_DIRECTIVE = /\/\*\s*!?\s*rtl:[^]*?\*\//img
 const REGEX_ESCAPE = /[.*+?^${}()|[\]\\]/g
 const REGEX_FUNCTION = /\([^()]+\)/i
-const REGEX_HEX_COLOR = /#[a-f0-9]{3,6}/ig
+const REGEX_HEX_COLOR = /#[a-f0-9]{3,8}/ig
 const REGEX_CALC = /calc/
 const REGEX_TOKENS = new RegExp(PATTERN_TOKEN, 'ig')
 const REGEX_TOKENS_WITH_NAME = new RegExp(PATTERN_TOKEN_WITH_NAME, 'ig')