Java 正则表达式详细使用

java.util.regex.Patternjava.util.regex.Matcher

String content = "Welcome, bob!";content.match("bob");  //falsecontent.match(".*bob")  //falsecontent.match(".*bob.*") //trueString str="test@yahoo.com.cn";Pattern pattern = Pattern.compile("[//w//.//-]+@([//w//-]+//.)+[//w//-]+",Pattern.CASE_INSENSITIVE);Matcher matcher = pattern.matcher(str);boolean a = matcher.matches(); //匹配的时候返回true

boolean b = matcher.find(); //包含正则匹配的串为true// 找到所有匹配的串while(matcher.find()) {  String extracted = matcher.group(0)}

matcher.replaceFirst("")matcher.replaceAll("");

group(0) 代表整个表达式String line = "#星座运势#20171013";String pattern = "//#(//p{L}*)//#(//d+)"; ///p{L} 匹配 unicode any kind of letter from any language// 创建 Pattern 对象Pattern r = Pattern.compile(pattern);// 现在创建 matcher 对象Matcher m = r.matcher(line);if (m.find( )) {  System.out.println("Found value: " + m.group(0) );  // "#星座运势#20171013"  System.out.println("Found value: " + m.group(1) );  // 星座运势  System.out.println("Found value: " + m.group(2) );  // 20171013} else {  System.out.println("NO MATCH");}