Fix RegExp bugs #2295

Job	Run time
build-test-api	3m 39s
build-on-windows-x64-uwp-x86-shared	7m 18s
build-on-macos	13m 15s
build-by-clang	4m 39s
build-test-codecache	17m 18s
build-test-debugger	3m 22s
build-test-on-android (x86, 28)	19m 37s
build-test-on-self-hosted-arm64-linux	13m 44s
build-test-on-android (x86_64, 28)	13m 20s
build-test-on-self-hosted-linux	23m 41s
build-test-on-self-hosted-arm-linux	14m 6s
build-test-on-x64-release (octane v8 web-tooling-benchmark)	15m 29s
build-test-on-x86-release (new-es octane)	5m 59s
build-test-on-x64-release (octane v8 web-tooling-benchmark, -DESCARGOT_THREADING=ON -DESCARGOT_TC...	16m 3s
build-test-on-x86-x64-debug	4m 28s
build-test-on-x86-release (v8 chakracore spidermonkey)	8m 7s
build-test-wasmjs	4m 26s
build-test-on-x64-release (chakracore spidermonkey new-es)	5m 8s
build-test-on-x86-release (jetstream-only-simple-parallel-1)	3m 18s
build-test-on-x64-release (chakracore spidermonkey new-es, -DESCARGOT_THREADING=ON -DESCARGOT_TCO...	5m 4s
build-test-on-x86-release (jetstream-only-simple-parallel-2 jsc-stress)	3m 58s
check-tidy	44s
build-test-on-x64-release (chakracore spidermonkey new-es, -DESCARGOT_SMALL_CONFIG=ON -DESCARGOT_...	5m 16s
build-test-on-x86-release (jetstream-only-simple-parallel-3 jetstream-only-cdjs)	4m 27s
test-on-windows-clang-cl (x86, -m32)	7m 8s
test-on-windows-x86-x64 (x86)	26m 28s
test-on-windows-x86-x64 (x64)	25m 16s
	4h 35m 18s

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