Java中的Matcher reset()方法与示例
该java.util.regex.Matcher中的类代表一个引擎，进行各种匹配操作。该类没有构造函数，可以使用matches()类java.util.regex.Pattern的方法创建/获取该类的对象。
在reset()此（匹配器）类的方法除去所有的状态信息和重置该字符序列到默认值，追加位置为零。
例1
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Reset {
public static void main(String[] args) {
String str = "<p>This <b>is</b> an <b>example</b>HTML <b>script</b> where <b>every</b> alternative <b>word</b> is <b>bold</b></p>.";
//正则表达式匹配粗体标签的内容
String regex = "<b>(\\S+)</b>";
//创建一个模式对象
Pattern pattern = Pattern.compile(regex);
//匹配字符串中的已编译模式
Matcher matcher = pattern.matcher(str);
while (matcher.find()) {
System.out.println("State of the matcher: "+matcher.toMatchResult());
String result = matcher.group(1);
}
matcher = matcher.reset();
System.out.println("State of the matcher after resetting it: "+matcher.toMatchResult());
}
}输出结果
State of the matcher: java.util.regex.Matcher[pattern=<b>(\S+)</b> region=0,116 lastmatch=<b>is</b>] State of the matcher: java.util.regex.Matcher[pattern=<b>(\S+)</b> region=0,116 lastmatch=<b>example</b>] State of the matcher: java.util.regex.Matcher[pattern=<b>(\S+)</b> region=0,116 lastmatch=<b>script</b>] State of the matcher: java.util.regex.Matcher[pattern=<b>(\S+)</b> region=0,116 lastmatch=<b>every</b>] State of the matcher: java.util.regex.Matcher[pattern=<b>(\S+)</b> region=0,116 lastmatch=<b>>word</b>] State of the matcher: java.util.regex.Matcher[pattern=<b>(\S+)</b> region=0,116 lastmatch=<b>bold</b>] State of the matcher: java.util.regex.Matcher[pattern=<b>(\S+)</b> region=0,116 lastmatch=] State of the matcher after resetting it: java.util.regex.Matcher[pattern=<b>(\S+)</b> region=0,116 lastmatch=]
此方法的另一个变体接受字符串数据并使用它重置Matcher。
例子2
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Reset {
public static void main(String[] args) {
String str = "<p>This <b>is</b> an <b>example</b> HTML <b>script</b> where <b>every</b> alternative <b>word</b> is <b>bold</b></p>.";
//正则表达式匹配粗体标签的内容
String regex = "(\\S+)";
//创建一个模式对象
Pattern pattern = Pattern.compile(regex);
//匹配字符串中的已编译模式
Matcher matcher = pattern.matcher(str);
while (matcher.find()) {
System.out.println("State of the matcher: "+matcher.toMatchResult());
String result = matcher.group(1);
}
matcher = matcher.reset("<b>this</b> is <b>new</b> string <b>after</b> reset");
while (matcher.find()) {
System.out.println("State of the matcher after resetting it: "+matcher.toMatchResult());
}
}
}输出结果
State of the matcher: java.util.regex.Matcher[pattern=<b>(\S+)</b> region=0,116 lastmatch=<b>is</b>] State of the matcher: java.util.regex.Matcher[pattern=<b>(\S+)</b> region=0,116 lastmatch=<b>example</b>] State of the matcher: java.util.regex.Matcher[pattern=<b>(\S+)</b> region=0,116 lastmatch=<b>script</b>] State of the matcher: java.util.regex.Matcher[pattern=<b>(\S+)</b> region=0,116 lastmatch=<b>every</b>] State of the matcher: java.util.regex.Matcher[pattern=<b>(\S+)</b> region=0,116 lastmatch=<b>word</b>] State of the matcher: java.util.regex.Matcher[pattern=<b>(\S+)</b> region=0,116 lastmatch=<b>bold</b>] State of the matcher after resetting it: java.util.regex.Matcher[pattern=<b>(\S+)</b> region=0,51 lastmatch=<b>this</b>] State of the matcher after resetting it: java.util.regex.Matcher[pattern=<b>(\S+)</b> region=0,51 lastmatch=<b>new</b>] State of the matcher after resetting it: java.util.regex.Matcher[pattern=<b>(\S+)</b> region=0,51 lastmatch=<b>after</b>]