An excerpt of the DefaultUrlMatching algorithm

segment_path_matching.ts

// Check each config part against the actual URL
for (let index = 0; index < parts.length; index++) {
  const part = parts[index];
  const segment = segments[index];
  const isParameter = part.startsWith(':');
  if (isParameter) {
    posParams[part.substring(1)] = segment;
  } else if (part !== segment.path) {
    // The actual URL part does not match the config, no match
    return null;
  }
}

return {consumed: segments.slice(0, parts.length), posParams};