Function isAlphanumericExtension

apps/sim/lib/uploads/utils/validation.ts:6–8

(ext: string)

 * that arise from non-filename document names (e.g. "Sim.ai <> RVTech").
 */
export function isAlphanumericExtension(ext: string): boolean {
  return /^[a-z0-9]+$/.test(ext)
}

function extractExtension(fileName: string): string {
  const lastDot = fileName.lastIndexOf('.')