JavaScript: Check whether the first character of a string is uppercase or not

JavaScript validation with regular expression: Exercise-1 with Solution

Check Uppercase First

Write a JavaScript program to test whether the first character of a string is uppercase or not.

Visual Presentation:

Sample Solution:

JavaScript Code:

function upper_case(str)
{
   regexp = /^[A-Z]/;
   if (regexp.test(str))
    {
      console.log("String's first character is uppercase");
    } 
    else
    {
      console.log("String's first character is not uppercase");
    }
}
upper_case('Abcd');
upper_case('abcd');

Output:

String's first character is uppercase
String's first character is not uppercase

Flowchart:

Live Demo:

See the Pen javascript-regexp-exercise-1 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that checks if the first character of a string is uppercase by comparing its char code with the ASCII range for uppercase letters.
• Write a JavaScript function that returns a boolean indicating whether the first character of a string is uppercase using a regular expression.
• Write a JavaScript function that extracts the first character of a string and compares it to its uppercase version to determine its case.
• Write a JavaScript function that validates the input and returns an error if it is not a string, then checks if the first character is uppercase.

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