js/src/regexp/validMentionPrecedingChars.js

// Copyright 2018 Twitter, Inc.
// Licensed under the Apache License, Version 2.0
// http://www.apache.org/licenses/LICENSE-2.0

const validMentionPrecedingChars = /(?:^|[^a-zA-Z0-9_!#$%&*@＠]|(?:^|[^a-zA-Z0-9_+~.-])(?:rt|RT|rT|Rt):?)/;
export default validMentionPrecedingChars;