netbox/netbox/utilities/forms/constants.py

# String expansion patterns
NUMERIC_EXPANSION_PATTERN = r'\[((?:\d+[?:,-])+\d+)\]'
ALPHANUMERIC_EXPANSION_PATTERN = r'\[((?:[a-zA-Z0-9]+[?:,-])+[a-zA-Z0-9]+)\]'

# IP address expansion patterns
IP4_EXPANSION_PATTERN = r'\[((?:[0-9]{1,3}[?:,-])+[0-9]{1,3})\]'
IP6_EXPANSION_PATTERN = r'\[((?:[0-9a-f]{1,4}[?:,-])+[0-9a-f]{1,4})\]'

# Boolean widget choices
BOOLEAN_WITH_BLANK_CHOICES = (
    ('', '---------'),
    ('True', 'Yes'),
    ('False', 'No'),
)