Function headerId

src/subParsers/headers.js:58–122

(m)

  });

  function headerId (m) {
    var title,
        prefix;

    // It is separate from other options to allow combining prefix and customized
    if (options.customizedHeaderId) {
      var match = m.match(/\{([^{]+?)}\s*$/);
      if (match && match[1]) {
        m = match[1];
      }
    }

    title = m;

    // Prefix id to prevent causing inadvertent pre-existing style matches.
    if (showdown.helper.isString(options.prefixHeaderId)) {
      prefix = options.prefixHeaderId;
    } else if (options.prefixHeaderId === true) {
      prefix = 'section-';
    } else {
      prefix = '';
    }

    if (!options.rawPrefixHeaderId) {
      title = prefix + title;
    }

    if (options.ghCompatibleHeaderId) {
      title = title
        .replace(/ /g, '-')
        // replace previously escaped chars (&, ¨ and $)
        .replace(/&/g, '')
        .replace(/¨T/g, '')
        .replace(/¨D/g, '')
        // replace rest of the chars (&~$ are repeated as they might have been escaped)
        // borrowed from github's redcarpet (some they should produce similar results)
        .replace(/[&+$,\/:;=?@"#{}|^¨~\[\]`\\*)(%.!'<>]/g, '')
        .toLowerCase();
    } else if (options.rawHeaderId) {
      title = title
        .replace(/ /g, '-')
        // replace previously escaped chars (&, ¨ and $)
        .replace(/&amp;/g, '&')
        .replace(/¨T/g, '¨')
        .replace(/¨D/g, '$')
        // replace " and '
        .replace(/["']/g, '-')
        .toLowerCase();
    } else {
      title = title
        .replace(/[^\w]/g, '')
        .toLowerCase();
    }

    if (options.rawPrefixHeaderId) {
      title = prefix + title;
    }