Java 中的 Matcher lookingAt()方法，带示例
原文:https://www . geesforgeks . org/matcher-lookingat-method-in-Java-with-examples/
匹配器类的 lookingAt() 方法尝试在匹配器中部分或全部匹配图案。它返回一个布尔值，显示模式是否从模式开始部分或完全匹配。
语法:
public boolean lookingAt()
参数:该方法不取任何参数。
返回值:这个方法返回一个布尔值，显示输入序列的前缀是否匹配这个匹配器的模式。
下面的例子说明了 Matcher.lookingAt()方法:
例 1:
// Java code to illustrate lookingAt() 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 possible result
// using lookingAt() method
System.out.println(matcher.lookingAt());
}
}
输出:
true
例 2:
// Java code to illustrate lookingAt() 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 possible result
// using lookingAt() method
System.out.println(matcher.lookingAt());
}
}
输出:
true
参考:https://docs . Oracle . com/javase/9/docs/API/Java/util/regex/matcher . html # lookingAt–
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