 fix codegen's regular expressions error (#27747)
 fix codegen's regular expressions error (#27747)

Signed-off-by: Zhou Zheng <09f3895e517d60e79aaa76aa20af41be09b9a9e2@microsoft.com>

Co-authored-by: Zhou Zheng <09f3895e517d60e79aaa76aa20af41be09b9a9e2@microsoft.com>
Azure/azure-sdk-for-java,Azure/azure-sdk-for-java,Azure/azure-sdk-for-java,Azure/azure-sdk-for-java,Azure/azure-sdk-for-java