字母数字字符定的字符串str,任务是检查字符串是否是一个有效的PAN(永久帐号)卡号码或不使用正则表达式。
有效的PAN卡号必须满足以下条件:
- 它应该是十个字符长。
- 前五个字符应为任何大写字母。
- 接下来的四个字符应为0到9之间的任何数字。
- 最后(第十个)字符应为任何大写字母。
- 它不应包含任何空格。
例子:
Input: str = “BNZAA2318J”
Output: true
Explanation:
The given string satisfies all the above mentioned conditions.
Input: str = “23ZAABN18J”
Output: false
Explanation:
The given string not starts with upper case alphabets, therefore it is not a valid PAN Card number.
Input: str = “BNZAA2318JM”
Output: false
Explanation:
The given string contains eleven characters, therefore it is not a valid PAN Card number.
Input: str = “BNZAA23184”
Output: true
Explanation:
The last(tenth) character of this string is a numeric(0-9) character, therefore it is not a valid PAN Card number.
Input: str = “BNZAA 23184”
Output: true
Explanation:
The given string contains white spaces, therefore it is not a valid PAN Card number.
方法:可以使用正则表达式解决此问题。
- 获取字符串。
- 创建一个正则表达式以验证PAN卡号,如下所述:
regex = "[A-Z]{5}[0-9]{4}[A-Z]{1}";
- 在哪里:
- [AZ] {5}表示前五个大写字母,可以是A到Z。
- [0-9] {4}代表可以为0-9的四个数字。
- [AZ] {1}表示一个大写字母,可以是A到Z。
- 在Java,使用regex匹配给定的字符串,这可以使用Pattern.matcher()来完成。
- 如果字符串与给定的正则表达式匹配,则返回true;否则返回false。
下面是上述方法的实现:
Java
// Java program to validate the
// PAN Card number using Regular Expression
import java.util.regex.*;
class GFG
{
// Function to validate the PAN Card number.
public static boolean isValidPanCardNo(String panCardNo)
{
// Regex to check valid PAN Card number.
String regex = "[A-Z]{5}[0-9]{4}[A-Z]{1}";
// Compile the ReGex
Pattern p = Pattern.compile(regex);
// If the PAN Card number
// is empty return false
if (panCardNo == null)
{
return false;
}
// Pattern class contains matcher() method
// to find matching between given
// PAN Card number using regular expression.
Matcher m = p.matcher(panCardNo);
// Return if the PAN Card number
// matched the ReGex
return m.matches();
}
// Driver Code.
public static void main(String args[])
{
// Test Case 1:
String str1 = "BNZAA2318J";
System.out.println(isValidPanCardNo(str1));
// Test Case 2:
String str2 = "23ZAABN18J";
System.out.println(isValidPanCardNo(str2));
// Test Case 3:
String str3 = "BNZAA2318JM";
System.out.println(isValidPanCardNo(str3));
// Test Case 4:
String str4 = "BNZAA23184";
System.out.println(isValidPanCardNo(str4));
// Test Case 5:
String str5 = "BNZAA 23184";
System.out.println(isValidPanCardNo(str5));
}
}
Python3
# Python3 program to validate the
# PAN Card number using Regular
# Expression
import re
# Function to validate the
# PAN Card number.
def isValidPanCardNo(panCardNo):
# Regex to check valid
# PAN Card number
regex = "[A-Z]{5}[0-9]{4}[A-Z]{1}"
# Compile the ReGex
p = re.compile(regex)
# If the PAN Card number
# is empty return false
if(panCardNo == None):
return False
# Return if the PAN Card number
# matched the ReGex
if(re.search(p, panCardNo) and
len(panCardNo) == 10):
return True
else:
return False
# Driver Code.
# Test Case 1:
str1 = "BNZAA2318J"
print(isValidPanCardNo(str1))
# Test Case 2:
str2 = "23ZAABN18J"
print(isValidPanCardNo(str2))
# Test Case 3:
str3 = "BNZAA2318JM"
print(isValidPanCardNo(str3))
# Test Case 4:
str4 = "BNZAA23184"
print(isValidPanCardNo(str4))
# Test Case 5:
str5 = "BNZAA 23184"
print(isValidPanCardNo(str5))
# This code is contributed by avanitrachhadiya2155
C++
// C++ program to validate the
// PAN Card number using Regular
// Expression
#include
#include
using namespace std;
// Function to validate the
// PAN Card number.
bool isValidPanCardNo(string panCardNo)
{
// Regex to check valid
// PAN Card number.
const regex pattern("[A-Z]{5}[0-9]{4}[A-Z]{1}");
// If the PAN Card number
// is empty return false
if (panCardNo.empty()) {
return false;
}
// Return true if the PAN Card number
// matched the ReGex
if (regex_match(panCardNo, pattern))
{
return true;
}
else
{
return false;
}
}
// Driver Code
int main()
{
// Test Case 1:
string str1 = "BNZAA2318J";
cout << isValidPanCardNo(str1) << endl;
// Test Case 2:
string str2 = "23ZAABN18J";
cout << isValidPanCardNo(str2) << endl;
// Test Case 3:
string str3 = "BNZAA2318JM";
cout << isValidPanCardNo(str3) << endl;
// Test Case 4:
string str4 = "BNZAA23184";
cout << isValidPanCardNo(str4) << endl;
// Test Case 5:
string str5 = "BNZAA 23184";
cout << isValidPanCardNo(str5) << endl;
return 0;
}
// This code is contributed by yuvraj_chandra
true
false
false
false
false