updated typecheck for regex and remove FlowFixMe (#3061)
updated typecheck for regex and remove FlowFixMe (#3061)


facebook/jest,skovhus/jest,facebook/jest,ide/jest,mpontus/jest,ide/jest,bookman25/jest,bookman25/jest,facebook/jest,bookman25/jest,cpojer/jest,skovhus/jest,mpontus/jest,cpojer/jest,mpontus/jest,ide/jest,skovhus/jest,cpojer/jest