Java 中的匹配器重置(CharSequence)方法,示例

原文:https://www . geesforgeks . org/matcher-resetcharsequence-method-in-Java-with-examples/

匹配器类重置(字符序列输入)方法用于重置该匹配器,并将作为参数传递的输入字符串插入该匹配器。

语法:

public Matcher reset(CharSequence input)

参数:该方法取参数输入,即复位后要插入匹配器的字符串。

返回值:此方法用此输入复位后返回此匹配器

以下示例说明了 Matcher.reset()方法:

例 1:

// Java code to illustrate reset() method

import java.util.regex.*;

public class GFG {
    public static void main(String[] args)
    {

        // Get the regex to be checked
        String regex = "Geeks";

        // Create a pattern from regex
        Pattern pattern
            = Pattern.compile(regex);

        // Get the String to be matched
        String stringToBeMatched = "GeeksForGeeks";

        // Create a matcher for the input String
        Matcher matcher
            = pattern
                  .matcher(stringToBeMatched);

        // Get the current matcher state
        System.out.println("Current Matcher: "
                           + matcher.toMatchResult());

        // Reset the Matcher using reset() method
        String newStringToBeMatched
            = "GeeksGeeksGeeks";
        matcher = matcher
                      .reset(newStringToBeMatched);

        // Get the current matcher state
        System.out.println("Current Matcher after Reset: "
                           + matcher.toMatchResult());
    }
}

Output:

Current Matcher:Java . util . regex . Matcher[pattern = Geeks region = 0,13 last match =] Reset 后的 Current Matcher:Java . util . regex . Matcher[pattern = Geeks region = 0,15 lastmatch=]

例 2:

// Java code to illustrate reset() method

import java.util.regex.*;

public class GFG {
    public static void main(String[] args)
    {

        // Get the regex to be checked
        String regex = "GFG";

        // Create a pattern from regex
        Pattern pattern = Pattern.compile(regex);

        // Get the String to be matched
        String stringToBeMatched
            = "GFGFGFGFGFGFGFGFGFG";

        // Create a matcher for the input String
        Matcher matcher
            = pattern
                  .matcher(stringToBeMatched);

        // Get the current matcher state
        System.out.println("Current Matcher: "
                           + matcher.toMatchResult());

        // Reset the Matcher using reset() method
        String newStringToBeMatched
            = "GFG means GeeksForGeeks";
        matcher = matcher
                      .reset(newStringToBeMatched);

        // Get the current matcher state
        System.out.println("Current Matcher after Reset: "
                           + matcher.toMatchResult());
    }
}

Output:

当前匹配器:Java . util . regex . Matcher[模式=GFG 区域=0,19 lastmatch=] 重置后的当前匹配器:Java . util . regex . Matcher[模式=GFG 区域=0,23 lastmatch=]

参考: 甲骨文文档