String regex = ".*\\\\([^\\.]+)\\..*"
input.replaceAll(regex, "$1")
不知道你用的什么语言:以下为Java
String str = "USE TEST"//标准String str2 = "USE [test]"//加[]
String str3 = "use [TEST]"//小写 +[] +
System.out.println(str.replaceAll("(?i)use\\s+","").replaceAll("[\\[\\]]",""))
System.out.println(str2.replaceAll("(?i)use\\s+","").replaceAll("[\\[\\]]",""))
System.out.println(str3.replaceAll("(?i)use\\s+","").replaceAll("[\\[\\]]",""))
// 输出: TEST test TEST
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