How to check a string is entirely made up of the same substring in JavaScript ?
Given a string and the task is to determine whether the string is made up of the same substrings or not.
Approach:
- Initialize a string to the variable.
- Use test() method to test a pattern in a string.
- The test() method returns true if match is found, otherwise it returns false.
Example 1: This example checks for string geeksgeeksgeeks which is made up of same substring, so it returns True.
<!DOCTYPE HTML> <html> <head> <title> How to check a string is entirely made of same substring ? </title> </head> <body style = "text-align:center;"> <h1 style = "color:green;" > GeeksForGeeks </h1> <p id = "GFG_UP" style = "font-size: 16px; font-weight: bold;"> </p> <button onclick = "gfg_Run()"> Click here </button> <p id = "GFG_DOWN" style = "color:green; font-size: 20px; font-weight: bold;"> </p> <script> var el_up = document.getElementById("GFG_UP"); var el_down = document.getElementById("GFG_DOWN"); var str = "geeksgeeksgeeks"; el_up.innerHTML = "Str = '" + str + "'"; function check(str) { return /^(.+)\1+$/.test(str) } function gfg_Run() { ans = "String is not made up of same substrings"; if (check(str)) { ans = "String is made up of same substrings"; } el_down.innerHTML = ans; } </script> </body> </html> |
Output:
- Before clicking on the button:
- After clicking on the button:
Example 2: This example checks for string geeksgeekgeeks which is not made up of same substrings so it returns False.
<!DOCTYPE HTML> <html> <head> <title> How to check a string is entirely made of same substring ? </title> </head> <body style = "text-align:center;"> <h1 style = "color:green;" > GeeksForGeeks </h1> <p id = "GFG_UP" style = "font-size: 16px; font-weight: bold;"> </p> <button onclick = "gfg_Run()"> Click here </button> <p id = "GFG_DOWN" style = "color:green; font-size: 20px; font-weight: bold;"> </p> <script> var el_up = document.getElementById("GFG_UP"); var el_down = document.getElementById("GFG_DOWN"); var str = "geeksgeekgeeks"; el_up.innerHTML = "Str = '" + str + "'"; function check(str) { return /^(.+)\1+$/.test(str) } function gfg_Run() { ans = "String is not made up of same substrings"; if (check(str)) { ans = "String is made up of same substrings"; } el_down.innerHTML = ans; } </script> </body> </html> |
Output:
- Before clicking on the button:
- After clicking on the button:
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