Given some Traditional Date Time Formats, the task is to check if they are valid or not using regular expressions. Rules for the valid format are:
- It should contain only digits (0 – 9) and a few words like (SEPTEMBER, Sep, SEP).
- It can only contain a few special characters like “:“, and “–“.
- It can only contain one white space.
Examples:
Input: “2023-01-01 01:01:01”
Output: TrueInput: “12/07/1998 12:00”
Output: False
Approach: The problem can be solved based on the following idea:
Create a regex pattern to validate the number as written below:
regex = “^([0-9]{4})-((01|02|03|04|05|06|07|08|09|10|11|12|(?:J(anuary|u(ne|ly))|February|Ma(rch|y)|A(pril|ugust)|(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)|(JANUARY|FEBRUARY|MARCH|APRIL|MAY|JUNE|JULY|AUGUST|SEPTEMBER|OCTOBER|NOVEMBER|DECEMBER)|(September|October|November|December)|(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)|(JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC)))|(january|february|march|april|may|june|july|august|september|october|november|december))-([0-3][0-9])\s([0-1][0-9]|[2][0-3]):([0-5][0-9]):([0-5][0-9])$“Where,
- ^ : Starting of the string.
- [0 – 9] {4} : 4 digits should be there
- \ : One of them should be present.
- $ : End of the string.
Follow the below steps to implement the idea:
- Create a regex expression for the Traditional DateTime Format.
- Use Pattern class to compile the regex formed.
- Use the matcher function to check whether the Format is valid or not.
- If it is valid, return true. Otherwise, return false.
Below is the implementation of the above approach:
C++
// C++ code to validate the// DateTime(YYYY-MM-DD HH:MM:SS) using Regular// Expression#include <iostream>#include <regex>using namespace std;// Function to validate the// DateTime(YYYY-MM-DD HH:MM:SS)string isValid_DateTime(string str){ // Regex to check valid // DateTime(YYYY-MM-DD HH:MM:SS). const regex pattern( "^([0-9]{4})-((01|02|03|04|05|06|07|08|09|10|11|12|" "(?:J(anuary|u(ne|ly))|February|Ma(rch|y)|A(pril|" "ugust)|(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|" "Nov|Dec)|(JANUARY|FEBRUARY|MARCH|APRIL|MAY|JUNE|" "JULY|AUGUST|SEPTEMBER|OCTOBER|NOVEMBER|DECEMBER)|(" "September|October|November|December)|(jan|feb|mar|" "apr|may|jun|jul|aug|sep|oct|nov|dec)|(JAN|FEB|MAR|" "APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC)))|(january|" "february|march|april|may|june|july|august|" "september|october|november|december))-([0-3][0-9])" "\\s([0-1][0-9]|[2][0-3]):([0-5][0-9]):([0-5][0-9])" "$"); // If the str // is empty return false if (str.empty()) { return "false"; } // Return true if the str // matched the ReGex if (regex_match(str, pattern)) { return "true"; } else { return "false"; }}// Driver Codeint main(){ // Test Case 1: string str1 = "2023-01-01 01:01:01"; cout << isValid_DateTime(str1) << endl; // Test Case 2: string str2 = "1998-07-12 18:01:01"; cout << isValid_DateTime(str2) << endl; // Test Case 3: string str3 = "1998-07-12"; cout << isValid_DateTime(str3) << endl; // Test Case 4: string str4 = "12/07/1998 12:00"; cout << isValid_DateTime(str4) << endl; // Test Case 5: string str5 = "1998-13-12 23:01:01"; cout << isValid_DateTime(str5) << endl; return 0;} |
Java
// Java program to validate the// DateTime(YYYY-MM-DD HH:MM:SS) using Regeximport java.util.regex.*;class GFG { // Function to validate the // DateTime(YYYY-MM-DD HH:MM:SS) public static boolean isValid_DateTime(String str) { // Regex to check valid // DateTime(YYYY-MM-DD HH:MM:SS) String regex = "^([0-9]{4})-((01|02|03|04|05|06|07|08|09|10|11|12|" + "(?:J(anuary|u(ne|ly))|February|Ma(rch|y)|" + "A(pril|ugust)|(Jan|Feb|Mar|Apr|May|Jun|Jul|" + "Aug|Sep|Oct|Nov|Dec)|(JANUARY|FEBRUARY|MARCH|" + "APRIL|MAY|JUNE|JULY|AUGUST|SEPTEMBER|OCTOBER|" + "NOVEMBER|DECEMBER)|(September|October|November|" + "December)|(jan|feb|mar|apr|may|jun|jul|aug|sep|" + "oct|nov|dec)|(JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP" + "|OCT|NOV|DEC)))|(january|february|march|april|may|" + "june|july|august|september|october|november|december))" + "-([0-3][0-9])\\s([0-1][0-9]|[2][0-3]):([0-5][0-9])" + ":([0-5][0-9])$"; // Compile the ReGex Pattern p = Pattern.compile(regex); // If the str // is empty return false if (str == null) { return false; } // Pattern class contains matcher() // method to find matching between // given str using regex. Matcher m = p.matcher(str); // Return if the str // matched the ReGex return m.matches(); } // Driver Code. public static void main(String args[]) { // Test Case 1: String str1 = "2023-01-01 01:01:01"; System.out.println(isValid_DateTime(str1)); // Test Case 2: String str2 = "1998-07-12 18:01:01"; System.out.println(isValid_DateTime(str2)); // Test Case 3: String str3 = "1998-07-12"; System.out.println(isValid_DateTime(str3)); // Test Case 4: String str4 = "12/07/1998 12:00:00"; System.out.println(isValid_DateTime(str4)); // Test Case 5: String str5 = "1998-13-12 23:01:01"; System.out.println(isValid_DateTime(str5)); }} |
Python3
# Python3 program to validate# DateTime(YYYY-MM-DD HH:MM:SS) using Regeximport re# Function to validate# DateTime(YYYY-MM-DD HH:MM:SS)def isValid_DateTime(str): # Regex to check valid DateTime # (YYYY-MM-DD HH:MM:SS) regex = "^([0-9]{4})-((01|02|03|04|05|06|07|08|09|10|11|12|" \ "(?:J(anuary|u(ne|ly))|February|Ma(rch|y)|A(pril|ugust)" \ "|(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)|" \ "(JANUARY|FEBRUARY|MARCH|APRIL|MAY|JUNE|JULY|AUGUST|" \ "SEPTEMBER|OCTOBER|NOVEMBER|DECEMBER)|(September|October|" \ "November|December)|(jan|feb|mar|apr|may|jun|jul|aug|sep|" \ "oct|nov|dec)|(JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|" \ "NOV|DEC)))|(january|february|march|april|may|june|july|" \ "august|september|october|november|december))-([0-3][0-9])" \ "\\s([0-1][0-9]|[2][0-3]):([0-5][0-9]):([0-5][0-9])$" # Compile the ReGex p = re.compile(regex) # If the string is empty # return false if (str == None): return "false" # Return if the string # matched the ReGex if(re.search(p, str)): return "true" else: return "false"# Driver codeif __name__ == '__main__': # Test Case 1: str1 = "2023-01-01 01:01:01" print(isValid_DateTime(str1)) # Test Case 2: str2 = "1998-07-12 18:01:01" print(isValid_DateTime(str2)) # Test Case 3: str3 = "1998-07-12" print(isValid_DateTime(str3)) # Test Case 4: str4 = "12 / 07 / 1998 12:00" print(isValid_DateTime(str4)) # Test Case 5: str5 = "1998-13-12 23:01:01" print(isValid_DateTime(str5)) |
C#
// C# program to validate the// DateTime(YYYY-MM-DD HH:MM:SS) //using Regular Expressionsusing System;using System.Text.RegularExpressions;class GFG{// Main Methodstatic void Main(string[] args){ // Input strings to Match // DateTime(YYYY-MM-DD HH:MM:SS) string[] str={"2023-01-01 01:01:01","1998-07-12 18:01:01" , "1998-07-12","12/07/1998 12:00", "1998-13-12 23:01:01"}; foreach(string s in str) { Console.WriteLine( isValid_DateTime(s) ? "true" : "false"); } Console.ReadKey(); }// method containing the regexpublic static bool isValid_DateTime(string str){ string strRegex = @"^([0-9]{4})-((01|02|03|04|05|06|07|08|09|10|11|12|(?:J(anuary|u(ne|ly))|February|Ma(rch|y)|A(pril|ugust)|(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)|(JANUARY|FEBRUARY|MARCH|APRIL|MAY|JUNE|JULY|AUGUST|SEPTEMBER|OCTOBER|NOVEMBER|DECEMBER)|(September|October|November|December)|(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)|(JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC)))|(january|february|march|april|may|june|july|august|september|october|november|december))-([0-3][0-9])\s([0-1][0-9]|[2][0-3]):([0-5][0-9]):([0-5][0-9])$"; Regex re = new Regex(strRegex); if (re.IsMatch(str)) return (true); else return (false);}} |
Javascript
// Javascript program to validate// DateTime(YYYY-MM-DD HH:MM:SS) using Regular Expression// Function to validate the// DateTime(YYYY-MM-DD HH:MM:SS)function isValid_DateTime(str) { // Regex to check valid // DateTime(YYYY-MM-DD HH:MM:SS) let regex = new RegExp(/^([0-9]{4})-((01|02|03|04|05|06|07|08|09|10|11|12|(?:J(anuary|u(ne|ly))|February|Ma(rch|y)|A(pril|ugust)|(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)|(JANUARY|FEBRUARY|MARCH|APRIL|MAY|JUNE|JULY|AUGUST|SEPTEMBER|OCTOBER|NOVEMBER|DECEMBER)|(September|October|November|December)|(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)|(JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC)))|(january|february|march|april|may|june|july|august|september|october|november|december))-([0-3][0-9])\s([0-1][0-9]|[2][0-3]):([0-5][0-9]):([0-5][0-9])$/) // if str // is empty return false if (str == null) { return "false"; } // Return true if the str // matched the ReGex if (regex.test(str) == true) { return "true"; } else { return "false"; }}// Driver Code// Test Case 1:let str1 = "2023-01-01 01:01:01";console.log(isValid_DateTime(str1));// Test Case 2:let str2 = "1998-07-12 18:01:01";console.log(isValid_DateTime(str2));// Test Case 3:let str3 = "1998-07-12";console.log(isValid_DateTime(str3));// Test Case 4:let str4 = "12/07/1998 12:00";console.log(isValid_DateTime(str4));// Test Case 5:let str5 = "1998-13-12 23:01:01";console.log(isValid_DateTime(str5)); |
Output
true true false false false
Time Complexity: O(N) for each testcase, where N is the length of the given string.
Auxiliary Space: O(1)
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