Java 中的 Pattern DOTALL 字段(含示例)
Pattern 类的 DOTALL 字段启用 dotall 模式。默认情况下,正则表达式中的“.”元字符匹配除换行符之外的所有字符。
示例 1
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class DOTALL_Example {
public static void main( String args[] ) {
String regex = ".";
String input = "this is a sample \nthis is second line";
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(input);
int count =0;
while(matcher.find()) {
count++;
System.out.print(matcher.group());
}
System.out.println();
System.out.println("Number of new line characters: \n"+count);
}
}输出
this is a sample this is second line Number of new line characters: 36
在 dot all 模式中,它匹配所有字符,包括换行符。
换句话说,当你将此用作 compile() 方法的标志值时,“.”元字符将匹配所有字符,包括换行符。
示例 2
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class DOTALL_Example {
public static void main( String args[] ) {
String regex = ".";
String input = "this is a sample \nthis is second line";
Pattern pattern = Pattern.compile(regex, Pattern.DOTALL);
Matcher matcher = pattern.matcher(input);
int count = 0;
while(matcher.find()) {
count++;
System.out.print(matcher.group());
}
System.out.println();
System.out.println("Number of new line characters: \n"+count);
}
}输出
this is a sample this is second line Number of new line characters: 37
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