Function isPattern

packages/effect/src/Schema.ts:6745–6758

(
  regExp: globalThis.RegExp,
  annotations?: Annotations.Filter
)

 * @since 4.0.0
 */
export function isPattern(
  regExp: globalThis.RegExp,
  annotations?: Annotations.Filter
): SchemaAST.Filter<string> {
  const source = regExp.source
  const flags = regExp.flags
  const runtimeRegExp = flags === ""
    ? `new RegExp(${format(source)})`
    : `new RegExp(${format(source)}, ${format(flags)})`
  return SchemaAST.isPattern(regExp, {
    toCode: () => ({ runtime: `Schema.isPattern(${runtimeRegExp})` }),
    ...annotations
  })
}

const IsPatternPayload = Struct({
  source: String,