正则表达式中Matcher上的4个方法

boolean matches()
boolean lookingAt()
boolean find()
boolean find(int start)

• matches()方法用来判断整个输入字符串是否匹配正则表达式模式
• lookingAt()用来判断该字符串（不必是整个字符串）的起始部分是否能够匹配模式
• find()用来在CharSequence中查找多个匹配。

//: strings/Finding.java
import java.util.regex.*;
import static net.mindview.util.Print.*;

public class Finding {
  public static void main(String[] args) {
    Matcher m = Pattern.compile("\w+")
      .matcher("Evening is full of the linnet's wings");
    while(m.find())
      printnb(m.group() + " ");
    print();
    int i = 0;
    while(m.find(i)) {
      printnb(m.group() + " ");
      i++;
    }
  }
} /* Output:
Evening is full of the linnet s wings
Evening vening ening ning ing ng g is is s full full ull ll l of of f the the he e linnet linnet innet nnet net et t s s wings wings ings ngs gs s
*///:~

find()像迭代器那样遍历输入的字符串，而第二个带参的find(int start)则是接受一个参数，该参数表示字符串中字符的位置，并以其为搜索的起点。