Version Number Pattern Csharp Example

version number pattern csharp example for production applications

csharp

advanced

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Regular Expression

/^[a-zA-Z_$][a-zA-Z0-9_$]*$/

Explanation

This regex pattern validates version number pattern csharp example. Commonly used by developers for input validation and form checking.

Code Examples

JavaScript Example

javascript

// version number pattern csharp example - JavaScript
const regex = /^[a-zA-Z_$][a-zA-Z0-9_$]*$/;

function validate(input) {
  if (!input || typeof input !== 'string') return false;
  return regex.test(input.trim());
}

// Usage examples
console.log(validate('variableName')); // true
console.log(validate('123var')); // false

Python Example

python

# version number pattern csharp example - Python
import re

pattern = r"^[a-zA-Z_$][a-zA-Z0-9_$]*$"
regex = re.compile(pattern)

def validate(input_str):
    if not input_str or not isinstance(input_str, str):
        return False
    return bool(regex.match(input_str.strip()))

# Usage examples
print(validate('variableName'))  # True
print(validate('123var'))  # False

PHP Example

php

<?php
// version number pattern csharp example - PHP
function validate($input) {
    if (!is_string($input) || empty(trim($input))) {
        return false;
    }
    
    $pattern = '/^[a-zA-Z_$][a-zA-Z0-9_$]*$/';
    return preg_match($pattern, trim($input)) === 1;
}

// Usage examples
var_dump(validate('variableName')); // bool(true)
var_dump(validate('123var')); // bool(false)
?>