JAVA replaceAll 正则表达式(持续更新)

JAVA replaceAll 正则表达式(持续更新)

Java String类自带了replaceAll 函数，支持正则表达式。

• replaceAll
  匹配数字：[0-9]
  

String tmp = "";

String content  = "1: In a newly-released report, IEA said it expected oil prices to start picking up in 2017.";

tmp = content.replaceAll( "[0-9]{1}" , "china");
System.out.println(tmp);

tmp = content.replaceAll( "[0-9]{2}" , "china");
System.out.println(tmp);

tmp = content.replaceAll( "[0-9]{3}" , "china");
System.out.println(tmp);

tmp = content.replaceAll( "[0-9]{4}" , "china");
System.out.println(tmp);

tmp = content.replaceAll( "[0-9]+" , "china");
System.out.println(tmp);

或用符号的正则表达式

String content  = "1: In a newly-released report, IEA said it expected oil prices to start picking up in 2017.";

tmp = content.replaceAll( "\\d{1}" , "china");
System.out.println(tmp);

tmp = content.replaceAll( "\\d{2}" , "china");
System.out.println(tmp);

tmp = content.replaceAll( "\\d{3}" , "china");
System.out.println(tmp);

tmp = content.replaceAll( "\\d{4}" , "china");
System.out.println(tmp);

tmp = content.replaceAll( "\\d+" , "china");
System.out.println(tmp);

输出结果：

china: In a newly-released report, IEA said it expected oil prices to start picking up in chinachinachinachina.
1: In a newly-released report, IEA said it expected oil prices to start picking up in chinachina.
1: In a newly-released report, IEA said it expected oil prices to start picking up in china7.
1: In a newly-released report, IEA said it expected oil prices to start picking up in china.
china: In a newly-released report, IEA said it expected oil prices to start picking up in china.