Function splitByRegex

tensorboard/webapp/util/string.ts:48–93

(
  text: string,
  regex: RegExp
)

 * ]
 */
export function splitByRegex(
  text: string,
  regex: RegExp
): Array<{index: number; matchesRegex: boolean; text: string}> {
  // 'matchAll' requires a regex with the 'global' flag.
  if (!regex.flags.includes('g')) {
    regex = new RegExp(regex, regex.flags + 'g');
  }

  const result = [];

  // Index of the earliest unvisited character.
  let lastIndex = 0;
  for (const match of text.matchAll(regex)) {
    const index = match.index as number;
    const matchingText = match[0];

    // Add any text between the last match and this current one.
    if (index > lastIndex) {
      result.push({
        index: lastIndex,
        text: text.substring(lastIndex, index),
        matchesRegex: false,
      });
    }

    result.push({
      index,
      text: matchingText,
      matchesRegex: true,
    });

    lastIndex = index + matchingText.length;
  }

  // Add the remaining text piece, if any.
  if (text.length > lastIndex) {
    result.push({
      index: lastIndex,
      text: text.substring(lastIndex, text.length),
      matchesRegex: false,
    });
  }

  return result;
}

// Based on
// https://cs.chromium.org/chromium/src/third_party/devtools-frontend/src/front_end/console/ConsoleViewMessage.js?q=linkstringregex