Java 正则表达式

Java 正则表达式

java.util.regex.Pattern
java.util.regex.Matcher

Match

match 是从字符串最头部开始匹配，一直到结束，需要匹配整个串

String content = "Welcome, bob!";
content.match("bob");    //false
content.match(".*bob")   //false
content.match(".*bob.*") //true


String str="[e-mail]";
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

Find

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)
}

Replace

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

Group

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");
}

参考资料

• http://www.oschina.net/code/s...
• http://www.runoob.com/java/ja...
• http://www.regular-expression...