fix: use first char of unescapedDelimiters

Author: cossssmin

lib/index.js

@@ -135,7 +135,7 @@ module.exports = function postHTMLExpressions (options) {
   before = escapeRegexpString(options.unescapeDelimiters[0])
   after = escapeRegexpString(options.unescapeDelimiters[1])
 
-  const unescapeDelimitersRegexp = new RegExp(`(?<!@${options.delimiters[0][0]}?)${before}(.+?)${after}`, 'g')
+  const unescapeDelimitersRegexp = new RegExp(`(?<!@${options.unescapeDelimiters[0][0]}?)${before}(.+?)${after}`, 'g')
 
   // Create an array of delimiters
   const delimiters = [