正则表达式

zhangzhanpei · zhangzhanpei · commit b6c5458f66fe · 2018-07-26T23:45:29.000+08:00
diff --git a/data-types/PatternDemo.java b/data-types/PatternDemo.java
@@ -0,0 +1,16 @@
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class PatternDemo {
+    public static void main(String[] args) {
+        String url = "demo.com/users.php?name=zhangsan";
+        Pattern pattern = Pattern.compile("(\\.(\\w+?))\\?");
+        Matcher matcher = pattern.matcher(url);
+        if (matcher.find()) {
+            // group() 即 group(0)，总是返回整个正则表达式命中的结果，这里返回 .php?
+            System.out.println(matcher.group());
+            // () 中的即为分组，这里返回 .php
+            System.out.println(matcher.group(1));
+        }
+    }
+}
