java.util.regex.Matcher.usePattern(Pattern newPattern)
方法更改此Matcher
用于查找匹配项的Pattern
。
声明
以下是java.util.regex.Matcher.usePattern(Pattern newPattern)
方法的声明。
public Matcher usePattern(Pattern newPattern)
参数
newPattern
- 此匹配器使用的新模式。
返回值
这个匹配。
异常
IllegalArgumentException
- 如果newPattern
为null
则抛出此异常。
示例
以下示例显示了java.util.regex.Matcher.usePattern(Pattern newPattern)
方法的用法。
package com.yiibai;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MatcherDemo {
private static String REGEX = "(a*b)(foo)";
private static String INPUT = "aabfooaabfooabfoob";
public static void main(String[] args) {
// create a pattern
Pattern pattern = Pattern.compile(REGEX);
// get a matcher object
Matcher matcher = pattern.matcher(INPUT);
while(matcher.find()) {
//Prints the start index of the subsequence captured by the given group.
System.out.println("Second Capturing Group, (foo) Match String start(): "+matcher.start(1));
}
matcher.reset();
matcher.usePattern(Pattern.compile("(a*b)(foob)"));
while(matcher.find()) {
//Prints the start index of the subsequence captured by the given group.
System.out.println("Second Capturing Group, (fooab) Match String start(): "+matcher.start(1));
}
}
}
编译并运行上面的程序,这将产生以下结果 -
Second Capturing Group, (foo) Match String start(): 0
Second Capturing Group, (foo) Match String start(): 6
Second Capturing Group, (foo) Match String start(): 12
Second Capturing Group, (fooab) Match String start(): 12