Java Pattern matcher(CharSequence)方法及示例

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Java Pattern matcher(CharSequence)方法及示例

Pattern 类的 matcher(CharSequence) 方法用于生成一个匹配器，该匹配器将有助于将给定的输入作为参数与该模式的方法匹配。Pattern.matches()方法在我们需要对一个文本进行一次性的模式检查时非常有用，而且Pattern类的默认设置也很合适。

语法

public Matcher matcher(CharSequence input)

参数： 该方法接受一个输入参数，代表要匹配的字符序列。

返回值： 该方法为该模式返回一个新的匹配器。

下面的程序说明了 matcher(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.");        }    }}

输出:

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");        }    }}

输出: