Function createReGroup

valdi/vscode_debugger/src/common/urlUtils.ts:280–292

(patterns: ReadonlySet<string>)

};

const createReGroup = (patterns: ReadonlySet<string>): string => {
  switch (patterns.size) {
    case 0:
      return '';
    case 1:
      return patterns.values().next().value;
    default:
      // Prefer the more compacy [aA] form if we're only matching single
      // characters, produce a non-capturing group otherwise.
      const arr = [...patterns];
      return arr.some(p => p.length > 1) ? `(?:${arr.join('|')})` : `[${arr.join('')}]`;
  }
};

/**
 * Converts and escape the file URL to a regular expression.