1. function validateForm(form, patterns) {
  2. const errors = {};
  4. for (const fieldName in form) {
  5. const fieldValue = form[fieldName];
  6. const pattern = patterns[fieldName];
  8. if (pattern) {
  9. const validationResult = validateField(fieldValue, pattern);
  10. if (validationResult.error) {
  11. errors[fieldName] = validationResult.error;
  12. }
  13. }
  14. }
  16. return errors;
  17. }
  19. function validateField(value, pattern) {
  20. try {
  21. const regex = new RegExp(pattern);
  22. if (!regex.test(value)) {
  23. return { error: pattern }; // Return the pattern as the error message
  24. }
  25. // Additional validation logic, e.g., length constraints
  26. if (pattern.includes("min=") && value.length < parseInt(pattern.substring(pattern.indexOf("min=") + 4))) {
  27. return { error: "Minimum length not met." };
  28. }
  29. if (pattern.includes("max=") && value.length > parseInt(pattern.substring(pattern.indexOf("max=") + 4))) {
  30. return { error: "Maximum length exceeded." };
  31. }
  33. return { success: true }; // Return success object if validation passes.
  34. } catch (error) {
  35. return { error: "Invalid pattern." }; // Handle invalid regex patterns
  36. }
  37. }
  39. // Example Usage:
  40. // Define your patterns
  41. const fieldPatterns = {
  42. name: /^[a-zA-Z\s]+$/, // Letters and spaces only
  43. email: /^[^\s@]+@[^\s@]+\.[^\s@]+$/, // Basic email format
  44. age: /^\d+$/, // Only digits
  45. zipCode: /^\d{5}(?:[-\s]\d{4})?$/, // US zip code format
  46. password: /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[!@#$%^&*()_+])[A-Za-z\d!@#$%^&*()_+]{8,}$/, // Strong password
  47. };
  49. // Example Form Data
  50. const formData = {
  51. name: "John Doe",
  52. email: "john.doe@example.com",
  53. age: "30",
  54. zipCode: "12345",
  55. password: "StrongP@sswOrd"
  56. };
  58. // Validate the form
  59. const validationErrors = validateForm(formData, fieldPatterns);
  61. // Display the errors
  62. if (Object.keys(validationErrors).length > 0) {
  63. console.log("Validation Errors:");
  64. for (const field in validationErrors) {
  65. console.log(`${field}: ${validationErrors[field]}`);
  66. }
  67. } else {
  68. console.log("Form is valid.");
  69. }

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