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法律学科Java 中的模式 LITERAL 字段示例
支持对模式的直接解析。在此，所有字符（包括转义序列和元字符）没有任何特殊含义，它们都作为直接字符对待。
例如，通常，如果你在给定的输入文本中搜索正则表达式“^This”，它将匹配以单词“This”开头的行。
示例 1
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";
//Regular expression to accept date in MM-DD-YYY format
String regex = "^This";
//Creating a Pattern object
Pattern pattern = Pattern.compile(regex,Pattern.LITERAL);
//Creating a Matcher object
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
^This Number of matches: 1
在直接模式下，元字符“^”没有意义，正则表达式“^This”匹配确切的单词。
示例 2
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";
//Regular expression to accept date in MM-DD-YYY format
String regex = "^This";
//Creating a Pattern object
Pattern pattern = Pattern.compile(regex,Pattern.LITERAL);
System.out.println("Usually it is printed as: \n"+input);
//Creating a Matcher object
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
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
更新日期: 05-12-2023
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