code: function (expressionClose, expressionOpen, s) {
        var sInner = ''
        var closeTag = null
        var openTag = null
        var findIndex = 0
  
        do {
          if (closeTag) {
            findIndex += closeTag[0].length
          }
          closeTag = this.findTag(expressionClose, s)
          if (!closeTag) {
            throw new Error('Unclosed ' + this.ldelim + expressionOpen + this.rdelim)
          }
          sInner += s.slice(0, closeTag.index)
          findIndex += closeTag.index
          s = s.slice((closeTag.index + closeTag[0].length))
          openTag = this.findTag(expressionOpen, sInner)
          if (openTag) {
            sInner = sInner.slice((openTag.index + openTag[0].length))
          }
        } while (openTag)
  
        closeTag.index = findIndex
        return closeTag
      }
docs: Find closing tag which matches. expressionClose.