Twice, sick.

Twice, poor old Elvis.

you wouldn't look at me twice.

偶尔两次 That's twice too occasional.

Multi byte character usually twice of width compare to single byte character.

你的照片会令这升价两倍 Your tintypes are gonna make this little epic twice as valuable.

This example opens a temporary file and writes a test string to it, then it prints out the content of this file twice.

我之前来过这里一两次 很方便请商务餐 I've been here once or twice before.

Returns a valid regular expression which will match string, ignoring case. This expression is string with each character converted to a bracket expression this bracket expression contains that character's uppercase and lowercase form if applicable, otherwise it contains the original character twice.