Java中的Pattern LITERAL字段的示例
启用模式的文字分析。在此，所有字符（包括转义序列和元字符）都没有任何特殊含义，它们被视为文字字符。
例如，通常，如果您在给定的输入文本中搜索正则表达式“^This”，则它将匹配以单词“This”开头的行。
示例
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class LTERAL_Example {
public static void main(String[] args) {
String input = "This is the first line\n"
+ "This is the second line\n"
+ "^This is the third line";
//正则表达式以MM-DD-YYY格式接受日期
String regex = "^This";
//创建一个Pattern对象
Pattern pattern = Pattern.compile(regex,Pattern.LITERAL);
//创建一个Matcher对象
Matcher matcher = pattern.matcher(input);
int count = 0;
while(matcher.find()) {
count++;
System.out.println(matcher.group());
}
System.out.println("Number of matches: "+count);
}
}输出结果
^This Number of matches: 1
在文字模式下，元字符“^”没有意义，并且正则表达式“^This”与确切的单词匹配。
示例
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class LTERAL_Example {
public static void main(String[] args) {
String input = "This is the first line\n"
+ "This is the second line\n"
+ "^This is the third line";
//正则表达式以MM-DD-YYY格式接受日期
String regex = "^This";
//创建一个Pattern对象
Pattern pattern = Pattern.compile(regex,Pattern.LITERAL);
System.out.println("Usually it is printed as: \n"+input);
//创建一个Matcher对象
Matcher matcher = pattern.matcher(input);
int count = 0;
while(matcher.find()) {
count++;
System.out.println(matcher.group());
}
System.out.println("Number of matches: "+count);
}
}输出结果
Usually it is printed as: This is the first line This is the second line ^This is the third line ^This Number of matches: 1