Java 中的模式匹配器(CharSequence)方法，示例
原文:https://www . geeksforgeeks . org/pattern-matchercharsequence-method-in-Java-with-examples/
模式类的匹配器(CharSequence) 方法用于生成匹配器，该匹配器有助于将给定的输入作为参数与该模式的方法进行匹配。当我们需要一次对照文本检查一个模式时，Pattern.matches()方法非常有用，并且 Pattern 类的默认设置是合适的。
语法:
public Matcher matcher(CharSequence input)
参数:该方法接受单个参数输入，代表要匹配的字符序列。
返回值:这个方法为这个模式返回一个新的匹配器。
下面的程序说明了匹配器(CharSequence)方法:
程序 1:
// Java program to demonstrate
// Pattern.matcher(CharSequence) method
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
// create a REGEX String
String REGEX = "(.*)(ee)(.*)?";
// create the string
// in which you want to search
String actualString
= "geeksforgeeks";
// create a Pattern
Pattern pattern = Pattern.compile(REGEX);
// get a matcher object
Matcher matcher = pattern.matcher(actualString);
// print values if match found
boolean matchfound = false;
while (matcher.find()) {
System.out.println("found the Regex in text:"
+ matcher.group()
+ " starting index:" + matcher.start()
+ " and ending index:"
+ matcher.end());
matchfound = true;
}
if (!matchfound) {
System.out.println("No match found for Regex.");
}
}
}
Output:
found the Regex in text:geeksforgeeks starting index:0 and ending index:13
程序 2:
// Java program to demonstrate
// Pattern.matcher(CharSequence) method
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
// create a REGEX String
String REGEX = "(.*)(welcome)(.*)?";
// create the string
// in which you want to search
String actualString
= "geeksforgeeks";
// create a Pattern
Pattern pattern = Pattern.compile(REGEX);
// get a matcher object
Matcher matcher = pattern.matcher(actualString);
// print values if match found
boolean matchfound = false;
while (matcher.find()) {
System.out.println("match found");
matchfound = true;
}
if (!matchfound) {
System.out.println("No match found");
}
}
}
Output:
No match found
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