isValidFormatPattern static method

bool isValidFormatPattern(
  1. String pattern
)

Validates if a date format pattern is valid

This is a basic validation - checks for common valid characters

Returns true if the pattern appears valid, false otherwise

Implementation

static bool isValidFormatPattern(String pattern) {
  if (pattern.isEmpty) {
    return false;
  }

  // Check for common valid format characters
  final validChars = RegExp(r'^[yMdHhmsSaAwWzZ\s\-/.,:]+$');
  return validChars.hasMatch(pattern);
}