old_contents: from django.core.validators import RegexValidator
  
  
  class RegexHolder(object):
      regex_dictionary = {
          # Match major[.minor], where major and minor are numbers between 0 and 255 with no leading 0s
          'sdk_version': r'^(0|[1-9]\d?|1\d{2}|2[0-4]\d|25[0-5])(\.(0|[1-9]\d?|1\d{2}|2[0-4]\d|25[0-5]))?$',
  
          # Match major.minor.0, where major and minor are numbers between 0 and 255 with no leading 0s
          'semver': r'^(0|[1-9]\d?|1\d{2}|2[0-4]\d|25[0-5])\.(0|[1-9]\d?|1\d{2}|2[0-4]\d|25[0-5])\.0$',
  
          # Match a string of letters and numbers separated with underscores but not starting with a digit
          'c_identifier': r'^([a-zA-Z_][_a-zA-Z\d]*)$',
  
          # Match a C identifier optionally followed by an [array index]
          'c_identifier_with_index': r'^([a-zA-Z_][_a-zA-Z\d]*)(?:\[(\d+)\])?$',
  
          # Match a UUID4
          'uuid': r'^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-4[0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}$',
  
          # Match a valid resource file name
          'resource_file_name': r'^[/a-zA-Z0-9_(). -]+$',
  
          # Match a valid c/h/js file name
          'source_file_name': r'^[/a-zA-Z0-9_.-]+\.(c|h|js)$'
      }
  
      def validator(self, key, message):
          return [RegexValidator(self.regex_dictionary[key], message=message)]
  
      def __getattr__(self, key):
          return self.regex_dictionary[key.lower()]
  
  
  regexes = RegexHolder()
  
new_contents: from django.core.validators import RegexValidator
  
  
  class RegexHolder(object):
      regex_dictionary = {
          # Match major[.minor], where major and minor are numbers between 0 and 255 with no leading 0s
          'sdk_version': r'^(0|[1-9]\d?|1\d{2}|2[0-4]\d|25[0-5])(\.(0|[1-9]\d?|1\d{2}|2[0-4]\d|25[0-5]))?$',
  
          # Match major.minor.0, where major and minor are numbers between 0 and 255 with no leading 0s
          'semver': r'^(0|[1-9]\d?|1\d{2}|2[0-4]\d|25[0-5])\.(0|[1-9]\d?|1\d{2}|2[0-4]\d|25[0-5])\.0$',
  
          # Match a string of letters and numbers separated with underscores but not starting with a digit
          'c_identifier': r'^\w+$',
  
          # Match a C identifier optionally followed by an [array index]
          'c_identifier_with_index': r'^(\w+)(?:\[(\d+)\])?$',
  
          # Match a UUID4
          'uuid': r'^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-4[0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}$',
  
          # Match a valid resource file name
          'resource_file_name': r'^[/a-zA-Z0-9_(). -]+$',
  
          # Match a valid c/h/js file name
          'source_file_name': r'^[/a-zA-Z0-9_.-]+\.(c|h|js)$'
      }
  
      def validator(self, key, message):
          return [RegexValidator(self.regex_dictionary[key], message=message)]
  
      def __getattr__(self, key):
          return self.regex_dictionary[key.lower()]
  
  
  regexes = RegexHolder()
  
subject: Correct regex for c identifiers