Given some Postman APIs, the task is to check if they are valid or not using regular expressions.
Rules for the valid API:
- It is an alphanumeric String, a combination of alphabets ( ‘a’ to ‘z’) and digits (0 to 9).
- It should always start with HTTP and must contain some special symbols (‘:’, ‘/’)
- It should not contain any whitespaces.
Examples:
Input: http://localhost:1337/api/products
Output: TrueInput: http://localhost:30000/user/kyc
Output: True
Approach: The problem can be solved using a regular expression based on the following idea:
Create a regex pattern to validate the number as written below:
regex= “^(ht|f)tp(s?)\\:\\/\\/[0-9a-zA-Z]([-.\\w]*[0-9a-zA-Z])*(:(0-9)*)*(\\/?)([a-zA-Z0-9\\-\\.\\?\\, \’\\/\\\\\\+&%\\$#_]*)?$“.Where,
^ : This indicates the start of the string
? : Represents either that character should be present or not.
[0-9a-zA-Z] : Any character either from digit or alphabet can be included.
$ :End of the string.
Follow the below steps to implement the idea:
- Create a regex expression for Postman API
- Use Pattern class to compile the regex formed.
- Use the matcher function to check whether the API is valid or not.
- If it is valid, return true. Otherwise, return false.
Below is the code implementation of the above approach:-
// C++ program to validate the // localhost API request processed by POSTMAN // using Regular Expression #include <bits/stdc++.h> #include <regex> using namespace std;
// Function to validate the // localhost API request processed by POSTMAN string isValidLocalhost_APIRequest(string str) { // Regex to check valid
// MICR Code.
const regex pattern(
"^(ht|f)tp(s?)\\:\\/\\/"
"[0-9a-zA-Z]([-.\\w]*[0-9a-zA-Z])*(:(0-9)*)*(\\/"
"?)([a-zA-Z0-9\\-\\.\\?\\, \'\\/"
"\\\\\\+&%\\$#_]*)?$" );
// If the str
// is empty return false
if (str.empty()) {
return "false" ;
}
// Return true if the str
// matched the ReGex
if (regex_match(str, pattern)) {
return "true" ;
}
else {
return "false" ;
}
} // Driver Code int main()
{ // Test Case 1:
cout << isValidLocalhost_APIRequest(str1) << endl;
// Test Case 2:
cout << isValidLocalhost_APIRequest(str2) << endl;
// Test Case 3:
cout << isValidLocalhost_APIRequest(str3) << endl;
// Test Case 4:
string str4 = "www.gmail.com" ;
cout << isValidLocalhost_APIRequest(str4) << endl;
// Test Case 5:
cout << isValidLocalhost_APIRequest(str5) << endl;
// Test Case 6:
string str6 = "localhost:8000/students" ;
cout << isValidLocalhost_APIRequest(str6) << endl;
return 0;
} |
// Java program to validate the // localhost API request processed by POSTMAN // using Regular Expression import java.util.regex.*;
class GFG {
// Function to validate the
// localhost API request processed by
// POSTMAN
public static boolean
isValidLocalhost_APIRequest(String str)
{
// Regex to check valid localhost API
// request
String regex
= "^(ht|f)tp(s?)\\:\\/\\/[0-9a-zA-Z]([-.\\w]"
+ "*[0-9a-zA-Z])*(:(0-9)*)*(\\/?)([a-zA-Z0-9\\"
+ "-\\.\\?\\, \'\\/\\\\\\+&%\\$#_]*)?$" ;
// Compile the ReGex
Pattern p = Pattern.compile(regex);
// If the str
// is empty return false
if (str == null ) {
return false ;
}
// Pattern class contains matcher()
// method to find matching between
// given Postman API request using regex.
Matcher m = p.matcher(str);
// Return if the str
// matched the ReGex
return m.matches();
}
// Driver code
public static void main(String args[])
{
// Test Case 1:
String str1 = "http:/"
+ "/localhost:8082/api/secure" ;
System.out.println(
isValidLocalhost_APIRequest(str1));
// Test Case 2:
String str2 = "http:/"
+ "/localhost:1337/api/products" ;
System.out.println(
isValidLocalhost_APIRequest(str2));
// Test Case 3:
String str3 = "https:/"
+ "/shiptos.com:8081/booking" ;
System.out.println(
isValidLocalhost_APIRequest(str3));
// Test Case 4:
String str4 = "www.gmail.com" ;
System.out.println(
isValidLocalhost_APIRequest(str4));
// Test Case 5:
String str5 = "http:/"
+ "/localhost:30000/sends/search" ;
System.out.println(
isValidLocalhost_APIRequest(str5));
// Test Case 6:
String str6 = "localhost:8000/students" ;
System.out.println(
isValidLocalhost_APIRequest(str6));
}
} |
# Python3 program to validate # localhost API request processed by POSTMAN # using Regular Expression import re
# Function to validate # localhost API request processed by POSTMAN def isValidLocalhost_APIRequest( str ):
# Regex to check valid localhost API request
# processed by POSTMAN
regex = "^(ht|f)tp(s?)\\:\\/\\/[0-9a-zA-Z]([-.\\w]" \
"*[0-9a-zA-Z])*(:(0-9)*)*(\\/?)([a-zA-Z0-9\\-\\.\\" \
"?\\, \'\\/\\\\\\+&%\\$#_]*)?$"
# Compile the ReGex
p = re. compile (regex)
# If the string is empty
# return false
if ( str = = None ):
return "false"
# Return if the string
# matched the ReGex
if (re.search(p, str )):
return "true"
else :
return "false"
# Driver code if __name__ = = '__main__' :
# Test Case 1:
print (isValidLocalhost_APIRequest(str1))
# Test Case 2:
print (isValidLocalhost_APIRequest(str2))
# Test Case 3:
print (isValidLocalhost_APIRequest(str3))
# Test Case 4:
str4 = "www.gmail.com"
print (isValidLocalhost_APIRequest(str4))
# Test Case 5:
print (isValidLocalhost_APIRequest(str5))
# Test Case 6:
str6 = "localhost:8000 / students"
print (isValidLocalhost_APIRequest(str6))
|
// C# program to validate the // localhost API request processed by POSTMAN // using Regular Expression using System;
using System.Text.RegularExpressions;
public class GFG{
// Function to validate the
// LEI Code
public static bool isValidLocalhost_APIRequest(String str)
{
// Regex to check valid localhost API
// request
var regex = new Regex( "^(ht|f)tp(s?)\\:\\/\\/[0-9a-zA-Z]([-.\\w]"
+ "*[0-9a-zA-Z])*(:(0-9)*)*(\\/?)([a-zA-Z0-9\\"
+ "-\\.\\?\\, \'\\/\\\\\\+&%\\$#_]*)?$" );
// If the str
// is empty return false
if (str == null )
{
return false ;
}
// Pattern class contains matcher()
// method to find matching between
// given Postman API request using regex.
var m = regex.Match(str);
// Return if the str
// matched the ReGex
return m.Success;
}
// Driver Code.
public static void Main(String[] args)
{
// Test Case 1:
var str1 = "http:/" + "/localhost:8082/api/secure" ;
Console.WriteLine(GFG.isValidLocalhost_APIRequest(str1));
// Test Case 2:
var str2 = "http:/" + "/localhost:1337/api/products" ;
Console.WriteLine(GFG.isValidLocalhost_APIRequest(str2));
// Test Case 3:
var str3 = "https:/" + "/shiptos.com:8081/booking" ;
Console.WriteLine(GFG.isValidLocalhost_APIRequest(str3));
// Test Case 4:
var str4 = "www.gmail.com" ;
Console.WriteLine(GFG.isValidLocalhost_APIRequest(str4));
// Test Case 5:
var str5 = "http:/" + "/localhost:30000/sends/search" ;
Console.WriteLine(GFG.isValidLocalhost_APIRequest(str5));
// Test Case 6:
var str6 = "localhost:8000/students" ;
Console.WriteLine(GFG.isValidLocalhost_APIRequest(str6));
}
} // This code is contributed by Potta Lokesh |
// Javascript program to validate the // localhost API request processed by POSTMAN // using Regular Expression // Function to validate the // localhost API request processed by POSTMAN function isValidLocalhost_APIRequest(str)
{ // Regex to check valid
// MICR Code.
let regex = new RegExp( "^(ht|f)tp(s?)\\:\\/\\/[0-9a-zA-Z]([-.\\w]*[0-9a-zA-Z])*(:(0-9)*)*(\\/?)([a-zA-Z0-9\\-\\.\\?\\, \’\\/\\\\\\+&%\\$#_]*)?$" );
// If the 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:
console.log(isValidLocalhost_APIRequest(str1)+ "<br>" );
// Test Case 2:
console.log(isValidLocalhost_APIRequest(str2)+ "<br>" );
// Test Case 3:
console.log(isValidLocalhost_APIRequest(str3)+ "<br>" );
// Test Case 4:
let str4 = "www.gmail.com" ;
console.log(isValidLocalhost_APIRequest(str4)+ "<br>" );
// Test Case 5:
console.log(isValidLocalhost_APIRequest(str5)+ "<br>" );
// Test Case 6:
let str6 = "localhost:8000/students" ;
console.log(isValidLocalhost_APIRequest(str6)+ "<br>" );
// This code is contributed by Utkarsh
|
true true true false true false
Time Complexity: O(N) for each testcase, where N is the length of the given string.
Auxiliary Space: O(1)
Related Articles: