Method scanRegexFlags

packages/compiler/src/expression_parser/lexer.ts:734–744

(start: number)

  }

  private scanRegexFlags(start: number): Token | null {
    if (!chars.isAsciiLetter(this.peek)) {
      return null;
    }

    while (chars.isAsciiLetter(this.peek)) {
      this.advance();
    }

    return newRegExpFlagsToken(start, this.index, this.input.substring(start, this.index));
  }
}

function isIdentifierStart(code: number): boolean {