Bash大小写不使用正则表达式，但是

Bash case does not use regular expressions, but shell pattern matching only.

因此，应该使用模式ws*.host.com(或ws-+([0-9]).host.com)代替正则表达式ws-[0-9]+\.host\.com，但这看起来有点高级，我从没尝试过:-)

Therefore, instead of regex ws-[0-9]+\.host\.com you should use pattern ws*.host.com (or ws-+([0-9]).host.com, but that looks a bit advanced and I've never tried that :-)