How to Check Whether a String Does Not Start With a Regex in JavaScript

To check if a string does not start with specific characters using a regular expression, use the test() function and negate it. Make sure your regular expression starts with ^, which is a special character that represents the start of the string.

function doesNotStartWithA(str) {
  return !/^A/.test(str);
}

Another approach is to use [^A]. [] denotes a set of characters to match, and ^ at the start of the set negates the set. So [^A] matches any character other than A.

function doesNotStartWithA(str) {
  return /^[^A]/.test(str);
}

More Fundamentals Tutorials

• Check if a Date is Valid in JavaScript
• Encode base64 in JavaScript
• Check if URL Contains a String
• JavaScript Add Month to Date
• JavaScript Add Days to Date
• 3 Patterns to Merge Arrays in JavaScript
• Convert a BigInt to a Number in JavaScript