message: refactor: simplify html parser attribute regex
diff: @@ -14,7 +14,7 @@ import { isNonPhrasingTag } from 'web/compiler/util'
  // Regular Expressions for parsing tags and attributes
  const singleAttrIdentifier = /([^\s"'<>/=]+)/
  -const singleAttrAssign = /(?:=)/
  +const singleAttrAssign = /(=)/
  const singleAttrValues = [
  // attr value double quotes
  /"([^"]*)"+/.source,
  @@ -25,7 +25,7 @@ const singleAttrValues = [
  ]
  const attribute = new RegExp(
  '^\\s*' + singleAttrIdentifier.source +
  - '(?:\\s*(' + singleAttrAssign.source + ')' +
  + '(?:\\s*' + singleAttrAssign.source +
  '\\s*(?:' + singleAttrValues.join('|') + '))?'
  )
  