import re

# 0123456789ABCDEF

re.compile(r'012345678')

re.compile(r'(\033|~{)')

re.compile(r'\A[+-]?\d+')

re.compile(r'(?P<name>[\w]+)|')

re.compile(r'\|\[\][123]|\{\}')

re.compile(r'^.$')

re.compile(r'[^A-Z]')

# 0123456789ABCDEF

re.sub('(?m)^(?!$)', indent*' ', s)

re.compile("(?:(?:\n\r?)|^)( *)\S")

re.compile("[]]")

re.compile("[^]]")

re.compile("[^-]")

#Lookbehind group

re.compile(r'x|(?<!\w)l')

#braces, not qualifier

re.compile(r"x{Not qual}")

#Multiple carets and dollars

re.compile("^(^y|^z)(u$|v$)$")

#Multiples

re.compile("ax{3}")

re.compile("ax{,3}")

re.compile("ax{3,}")

re.compile("ax{01,3}")

#Negative lookahead

re.compile(r'(?!not-this)^[A-Z_]+$')

#Negative lookbehind

re.compile(r'^[A-Z_]+$(?<!not-this)')

#OK -- ODASA-ODASA-3968

re.compile('(?:[^%]|^)?%\((\w*)\)[a-z]')

#ODASA-3985

#Half Surrogate pairs

re.compile(u'[\uD800-\uDBFF][\uDC00-\uDFFF]')

#Outside BMP

re.compile(u'[\U00010000-\U0010ffff]')

#Modes

re.compile("", re.VERBOSE)

re.compile("", flags=re.VERBOSE)

re.compile("", re.VERBOSE|re.DOTALL)

re.compile("", flags=re.VERBOSE|re.IGNORECASE)

re.search("", None, re.UNICODE)

x = re.search("", flags=re.UNICODE)

# using addition for flags was reported as FP in https://github.com/github/codeql/issues/4707

re.compile("", re.VERBOSE+re.DOTALL)

# re.X is an alias for re.VERBOSE

re.compile("", re.X)

#Inline flags; 'a', 'L' and 'u' are mutually exclusive

re.compile("(?aimsx)a+")

re.compile("(?ui)a+")

re.compile(b"(?Li)a+")

#Group with inline flags; TODO: these are not properly parsed and handled yet

re.compile("(?aimsx:a+)")

re.compile("(?-imsx:a+)")

re.compile("(?a-imsx:a+)")

#empty choice

re.compile(r'|x')

re.compile(r'x|')

#Named group with caret and empty choice.

re.compile(r'(?:(?P<n1>^(?:|x)))')

#Misparsed

re.compile(r"\[(?P<txt>[^[]*)\]\((?P<uri>[^)]*)")

re.compile("", re.M) # ODASA-8056

# FP reported in https://github.com/github/codeql/issues/3712

# This does not define a regex (but could be used by other code to do so)

escaped = re.escape("https://www.humblebundle.com/home/library")

# Consistency check

baz = re.compile(r'\+0')

# Anchors

re.compile(r'\Afoo\Z')

re.compile(r'\bfoo\B')