java.util.regex.Pattern

java.util.regex.Matcher

String content = "Welcome, bob!";

content.match("bob");    //false

content.match(".*bob")   //false

content.match(".*bob.*") //true

String 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");

}