Question

我不了解replaceAll方法的工作原理。更具体地说，第一个参数采用字符串正则表达式。我想删除所有不是数字的字符，包括句点。

我的实施。

    userId = inputRow.next().replaceAll("[\\.^\\d.]", "");

示例输出：

"","",""
"","",""
"","",""
"","BBLDX",""
"","N",""
"","",""
"","",""
"","",""
"","",""
"","",""
"","",""
"","",""
"","",""
"","",""

删除除字母之外的所有内容

Answer 1

正则表达式中有错误。
它应该是＆＃34; [^ \\ d]＆＃34;。
这将替换所有不是数字的字符。

Answer 2

你可以这样做：

userId = inputRow.next().replaceAll("[^\\d]", "");

[^ \\ d]将匹配所有不是数字的字符序列，并将其替换为空字符串。

Answer 3

String text = "afadsfas1234fasdfadsf.fasdf.sadfadsf.afadsf.5678";
System.out.println(text);
//  /D is equal to a non digit. [^0-9]
String result = text.replaceAll("[\\.\\D]", "");
System.out.println(result);
//Result will be 12345678

以上代码将帮助您删除所有不是数字的字符，包括句点。 \ d表示数字0-9，\ D表示非数字数字。

删除所有不是数字的字符，包括句点

3 个答案: