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法律研究Java 中带示例的 Pattern CASE_INSENSITIVE 字段
Pattern 类的此 CASE_INSENSITIVE 字段匹配不分大小写的字符。当您使用它作为 compile() 方法的标志值时，并且如果使用正则表达式搜索字符，那么两种大小写的字符都将匹配。
注意 - 默认情况下，此标志仅匹配 ASCII 字符
示例 1
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class CASE_INSENSITIVE_Example {
public static void main( String args[] ) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter input data: ");
String input = sc.nextLine();
System.out.println("Enter required character: ");
char ch = sc.next().toCharArray()[0];
//Regular expression to find the required character
String regex = "["+ch+"]";
//Compiling the regular expression
Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);
//Retrieving the matcher object
Matcher matcher = pattern.matcher(input);
int count =0;
while (matcher.find()) {
count++;
}
System.out.println("The letter "+ch+" occurred "+count+" times in the given text (irrespective of case)");
}
}输出
Enter input data: Tutorials Point originated from the idea that there exists a class of readers who respond better to online content and prefer to learn new skills at their own pace from the comforts of their drawing rooms. Enter required character: T The letter T occurred 20 times in the given text (irrespective of case)
示例 2
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class VerifyBoolean {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter a string value: ");
String str = sc.next();
Pattern pattern = Pattern.compile("true|false", Pattern.CASE_INSENSITIVE);
Matcher matcher = pattern.matcher(str);
if(matcher.matches()){
System.out.println("Given string is a boolean type");
} else {
System.out.println("Given string is not a boolean type");
}
}
}输出 1
Enter a string value: true Given string is a boolean type
输出 2
Enter a string value: false Given string is a boolean type
输出 3
Enter a string value: hello Given string is not a boolean type
更新于：20-Nov-2019
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