String str="abc efg ABC";

String regEx="a|f"; //表示a或f

Pattern p=Pattern.compile(regEx);

Matcher m=p.matcher(str);

boolean rs=m.find();

String regEx=".+\(.+)$";

String str="c:\dir1\dir2\name.txt";

Pattern p=Pattern.compile(regEx);

Matcher m=p.matcher(str);

boolean rs=m.find();

for(int i=1;i<=m.groupCount();i++){

System.out.println(m.group(i));
}

String regEx="::";

Pattern p=Pattern.compile(regEx);

String[] r=p.split("xd::abc::cde");

執(zhí)行后，r就是{"xd","abc","cde"}，其實(shí)分割時(shí)還有跟簡(jiǎn)單的方法：

String str="xd::abc::cde";

String[] r=str.split("::");

String regEx="a+"; //表示一個(gè)或多個(gè)a

Pattern p=Pattern.compile(regEx);

Matcher m=p.matcher("aaabbced a ccdeaa");

String s=m.replaceAll("A");

String s=m.replaceAll("");