refactor: use starting char of delimiter from options

Author: cossssmin

lib/index.js

@@ -130,12 +130,12 @@ module.exports = function postHTMLExpressions (options) {
   let before = escapeRegexpString(options.delimiters[0])
   let after = escapeRegexpString(options.delimiters[1])
 
-  const delimitersRegexp = new RegExp(`(?<!@{?)${before}(.+?)${after}`, 'g')
+  const delimitersRegexp = new RegExp(`(?<!@${options.delimiters[0][0]}?)${before}(.+?)${after}`, 'g')
 
   before = escapeRegexpString(options.unescapeDelimiters[0])
   after = escapeRegexpString(options.unescapeDelimiters[1])
 
-  const unescapeDelimitersRegexp = new RegExp(`(?<!@{?)${before}(.+?)${after}`, 'g')
+  const unescapeDelimitersRegexp = new RegExp(`(?<!@${options.delimiters[0][0]}?)${before}(.+?)${after}`, 'g')
 
   // Create an array of delimiters
   const delimiters = [