app/javascript/mastodon/utils/hashtags.js


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const HASHTAG_SEPARATORS = '_\\u00b7\\u200c';
const ALPHA = '\\p{L}\\p{M}';
const WORD = '\\p{L}\\p{M}\\p{N}\\p{Pc}';

const buildHashtagPatternRegex = () => {
  try {
    return new RegExp(
      '(?:^|[^\\/\\)\\w])#((' +
      '[' + WORD + '_]' +
      '[' + WORD + HASHTAG_SEPARATORS + ']*' +
      '[' + ALPHA + HASHTAG_SEPARATORS + ']' +
      '[' + WORD + HASHTAG_SEPARATORS +']*' +
      '[' + WORD + '_]' +
      ')|(' +
      '[' + WORD + '_]*' +
      '[' + ALPHA + ']' +
      '[' + WORD + '_]*' +
      '))', 'iu',
    );
  } catch {
    return /(?:^|[^/)\w])#(\w*[a-zA-Z·]\w*)/i;
  }
};

const buildHashtagRegex = () => {
  try {
    return new RegExp(
      '^((' +
      '[' + WORD + '_]' +
      '[' + WORD + HASHTAG_SEPARATORS + ']*' +
      '[' + ALPHA + HASHTAG_SEPARATORS + ']' +
      '[' + WORD + HASHTAG_SEPARATORS +']*' +
      '[' + WORD + '_]' +
      ')|(' +
      '[' + WORD + '_]*' +
      '[' + ALPHA + ']' +
      '[' + WORD + '_]*' +
      '))$', 'iu',
    );
  } catch {
    return /^(\w*[a-zA-Z·]\w*)$/i;
  }
};

export const HASHTAG_PATTERN_REGEX = buildHashtagPatternRegex();

export const HASHTAG_REGEX = buildHashtagRegex();