Python: Regex

Quick Reference

All

https://regex101.com/

Token	Description
Newline	\n
Carriage return	\r
Null character	\0
A single character of: a, b, or c	[abc]
A character except: a, b, c	[^a,b,c]
A character in the range a-z	[a-z]
A character not in the range a-z	[^a-z]
A character in the range a-z or A-Z	[a-zA-Z]
Any single character	.
Any whitespace character	\s
Any non-whitespace character	\S
any digit	\d
Any non-digit	\D
Any word character	\w
Any non-word character	\W
Vertical whitespace character	\v
Match nth subpattern	\n
Hex character YY	\xYY
Octal character ddd	\ddd
Backspace character	[\b]
Makes any character literal	\
Capture everything enclosed	(...)
Match either a or b	(a|b)
Match everything enclosed	(?:...)
Comment	(?#...)
Named Capturing Group	(?P<name>...)
Inline modifiers	(?imsxXU)
Conditional statement	(?(1)yes|no)
Match subpattern `name`	(?P=name)
Positive Lookahead	(?=...)
Negative Lookahead	(?!...)
Positive Lookbehind	(?<...)
Negative Lookbehind	(?<!...)
Zero or one of a	a?
Zero or more of a	a*
One or more of a	a+
Exatly 3 of a	a{3}
Between 3 and 6 of a	a{3, 6}
Greedy quantifier	a*
Lazy quantifier	a*?
Start of string	^
End of string	$
Start of string	\A
End of string	\Z
A word boundary	\b
A word boundary with postgres	\y
A non word boundary	\b
A non word boundary with postgres	\Y
Global	g
Multiline	m
Case insensitive	i
Ignore whitespace	x
Single line	s
Enable unicode support	u
Restrict matches to ASCII only	a
Complete match contents	\g<0>
Complete match contents	\0
Contents in capture group 1	\1
Contents in capture group 1	$1
Contents in capture group `foo`	${foo}
Hexadecimal replacement values	\x20
Hexadecimal replacement values	\x{06fa}
Tab	\t
Carriage return	\r
Newline	\n
Form-feed	\f
Uppercase Transformation	\U
Lowercase Transformation	\L
Terminate any Transformation	\E
3 or more of a	a{3,}

Examples

Port

port_regex = re.compile(r'\b('
                        r'6553[0-5]|'
                        r'655[0-2][0-9]|'
                        r'65[0-4][0-9][0-9]|'
                        r'6[0-4][0-9][0-9][0-9]|'
                        r'[1-5][0-9][0-9][0-9][0-9]|'
                        r'[1-9][0-9][0-9][0-9]|'
                        r'[1-9][0-9][0-9]|'
                        r'[1-9][0-9]|'
                        r'[1-9])'
                        r'\b')
port_regex = r'([0-9]{1,4}|[1-5][0-9]{4}|6[0-4][0-9]{3}|65[0-4][0-9]{2}|655[0-2][0-9]|6553[0-5])'

IP

ip = re.compile('^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$')

ip_regex = r'(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)'
cidr_regex = r'(?:/(?:[12][0-9]|3[0-2])|[0-9])'
ip_range_regex = r'(?:-(?:25[0-5]|2[0-4][0-9]|1[0-9]{2}|9[0-9]|[1-8][0-9]|[1-9]))'

target_regex = re.compile(r'{ip_regex}{cidr_regex}?{ip_range_regex}?'.format(
    ip_regex=ip_regex, cidr_regex=cidr_regex, ip_range_regex=ip_range_regex))

NIE

r'^[XYZ]\d{7}[ABCDEFGHJKLMNPQRSTVWXYZ]'

DNI

r'\d{8}[ABCDEFGHJKLMNPQRSTVWXYZ]'

Spanish License Plates

r'\w{0,2}\d{4}\w{1,3}'

E-MAIL

EMAIL = r"([a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+)"

IBAN

IBAN = r"[a-zA-Z]{2}[0-9]{2} ?[a-zA-z0-9]{0,4} ?[a-zA-z0-9]{0,4} ?[a-zA-z0-9]{0,3}(?:[a-zA-z0-9] ?[a-zA-z0-9]{0,4} ?[a-zA-z0-9]{0,4} ?[a-zA-z0-9]{0,4} ?[a-zA-z0-9]{0,3})?"

Payment Account Number

PAN = r"\b(?:\d[ -]*?){13,19}\b"

Zip Code

ZIP_CODE_SPAIN = r"0[1-9][0-9]{3}|\D[1-4][0-9]{4}|\D5[0-2][0-9]{3}\D"

Phone Number

sep = '(:?\s+|-|\.)?' # separator
phone_re = re.compile(r'''
  (\d{3}|\(\d{3}\))  # area code
  {sep}              # separator
  (\d{3})            # first 3
  {sep}              # separator
  (\d{4})            # last 4
'''.format(sep=sep), re.VERBOSE)

Spain Phone

spainphones = r"(?:(?:\+?34(?:[ \t|\-])?)?[9|6|7](?:(?:\d{1}(?:[ \t|\-])?[0-9]{3})|(?:\d{2}(?:[ \t|\-])?[0-9]{2}))(?:[ \t|\-])?[0-9]{2}(?:[ \t|\-])?[0-9]{2})"