Gerador GUID

// JavaScript / TypeScript - browser & Node 18+
const guid = crypto.randomUUID();
// "550e8400-e29b-41d4-a716-446655440000" (no braces)

// Add braces (Microsoft registry convention)
const withBraces = `{${guid}}`;
// "{550e8400-e29b-41d4-a716-446655440000}"

// Uppercase (SQL Server UNIQUEIDENTIFIER style)
const upper = guid.toUpperCase();
// "550E8400-E29B-41D4-A716-446655440000"

// Hyphen-stripped (compact 32-char form)
const compact = guid.replace(/-/g, '');
// "550e8400e29b41d4a716446655440000"

// C# / .NET
Guid g = Guid.NewGuid();              // v4
string s = g.ToString();              // "550e8400-e29b-41d4-..."
string b = g.ToString("B");           // "{550e8400-e29b-41d4-...}"
string n = g.ToString("N");           // "550e8400e29b41d4..." (no hyphens)
string p = g.ToString("P");           // "(550e8400-e29b-41d4-...)"

// PowerShell
$guid = [guid]::NewGuid()             # v4
$guid.ToString("B")                   # "{550e8400-e29b-...}"
# Or use the cmdlet
$guid = New-Guid

// SQL Server
-- SELECT NEWID()         -- random v4
-- SELECT NEWSEQUENTIALID() -- sequential (less fragmentation)

// RFC 4122 validation regex (case-insensitive)
const guidRegex = /^{?[0-9a-f]{8}-[0-9a-f]{4}-[1-8][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}}?$/i;

function isValidGuid(str) {
  return guidRegex.test(str);
}

console.log(isValidGuid('550e8400-e29b-41d4-a716-446655440000'));  // true
console.log(isValidGuid('{550e8400-e29b-41d4-a716-446655440000}')); // true (braces)
console.log(isValidGuid('550E8400-E29B-41D4-A716-446655440000'));   // true (upper)
console.log(isValidGuid('not-a-guid'));                              // false
console.log(isValidGuid('550e8400-e29b-01d4-a716-446655440000'));   // false (v0)
console.log(isValidGuid('550e8400-e29b-41d4-c716-446655440000'));   // false (variant)

// Extract version and variant
function guidInfo(str) {
  const clean = str.replace(/[{}-]/g, '').toLowerCase();
  const version = parseInt(clean[12], 16);
  const variantChar = parseInt(clean[16], 16);
  const variant = variantChar >= 8 && variantChar <= 0xb ? 'RFC 4122' :
                  variantChar === 0 ? 'NCS' :
                  variantChar >= 0xc && variantChar <= 0xf ? 'Microsoft' :
                  'Reserved';
  return { version, variant };
}