Python regular expression (regex) Cheat Sheet by mutanclan - Download free from Cheatography - Cheatography.com: Cheat Sheets For Every Occasion Download This Cheat Sheet (PDF). The Python RegEx Cheat Sheet for Budding Programmers Get Creative When Using Python Learning Python's regular expressions is a big step towards becoming a better Python programmer, but that's just one of the few things you need to do. However, playing around with its syntaxes and getting creative with them polishes your coding skill. Python unittest Assertions Enjoy this cheat sheet at its fullest within Dash, the macOS documentation browser. Regular Expressions Cheat Sheet by DaveChild - Cheatography.com Created Date: 4237Z.
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Special characters
.Default: Match any character except newline.DOTALL: Match any character including newline^Default: Match the start of a string^MULTILINE: Match immediatly after each newline$Match the end of a string$MULTILINE: Also match before a newline*Match 0 or more repetitions of RE+Match 1 or more repetitions of RE?Match 0 or 1 repetitions of RE*?, *+, ??Match non-greedy as few characters as possible{m}Match exactly m copies of the previous RE{m,n}Match from m to n repetitions of RE{m,n}?Match non-greedyEscape special characters[]Match a set of characters|RE1|RE2: Match either RE1 or RE2 non-greedy(...)Match RE inside parantheses and indicate start and end of a groupWith RE is the resulting regular expression.Special characters must be escaped with if it should match the character literally
Methods of 're' module
re.compile(pattern,
flags=0)Compile a regular expression pattern into a regular expression object. Can be used with match(), search() and othersre.search(
pattern,
string,
flags=0Search through string matching the first location of the RE. Returns a match object or Nonere.match(
pattern,
string,
flags=0)If zero or more characters at the beginning of a string match pattern return a match object or Nonere.fullmatch(
pattern,
string,
flags=0)If the whole string matches the pattern return a match object or Nonere.split(
pattern,
string,
maxsplit=0,
flags=0)Split string by the occurrences of patternmaxsplit times if non-zero. Returns a list of all groups.re.findall(
pattern,
string,
flags=0)Return all non-overlapping matches of pattern in string as list of strings.re.finditer(
pattern,
string,
flags=0)Return an iterator yielding match objects over all non-overlapping matches for the pattern in stringre.sub(
pattern,
repl,
string,
count=0,
flags=0)Return the string obtained by replacing the leftmost non-overlapping occurrences of pattern in string by the replacement
Regex In Python Cheat Sheet Examples
repl. repl can be a function.re.subn
(
pattern,
repl,
string,
count=0,
flags=0)Like sub but return a tuple (new_string, number_of_subs_made)re.escape(
pattern)Escape special characters in pattern
pattern,
repl,
string,
count=0,
flags=0)Like sub but return a tuple (new_string, number_of_subs_made)re.escape(
pattern)Escape special characters in pattern
re.purge()Clear the regular expression cache
template)Return the string obtained by doing backslash substitution on template, as done by the sub() methodMatch.group(
[group1,...])Returns one or more subgroups of the match. 1 Argument returns string and more arguments return a tuple.Match.__getitem__(
g)Access groups with m[0], m[1] ...Match.groups(
default=None)Return a tuple containing all the subgroups of the matchMatch.groupdict(
default=None)Return a dictionary containing all the named subgroups of the match, keyed by the subgroup name.Match.start(
[group]
Match.end(
[group])Return the indices of the start and end of the substring matched by groupMatch.span(
[group])For a match m, return the 2-tuple
string[,
pos[,
endpos]]
Raw String Notation
In raw string notationr'text' there is no need to escape the backslash character again.>>> re.match(r'W(.)1W', ' ff ')>>> re.match('W(.)1W', ' ff ')Reference
https://docs.python.org/3/howto/regex.htmlhttps://docs.python.org/3/library/re.htmlExtensions
(?...)This is the start of an extension(?aiLmsux)The letters set the correspondig flags See flags(?:...)A non-capturing version of regular parantheses(?P...)Like regular paranthes but with a named group(?P=name)A backreference to a named group(?#...)A comment(?=...)lookahead assertion: Matches if ... matches next without consuming the string(?!...)negative lookahead assertion: Matches if ... doesn't match next(?<=....)positive lookbehind assertion: Match if the current position in the string is preceded by a match for ... that ends the current position(?<!...)negative lookbehind assertion: Match if the current position in the string is not preceded by a match for ...(?(id/name)yes-pattern|no-pattern)Match with yes-pattern if the group with gived id or name exists and with no-pattern if notMatch objects
Match.expand(template)Return the string obtained by doing backslash substitution on template, as done by the sub() methodMatch.group(
[group1,...])Returns one or more subgroups of the match. 1 Argument returns string and more arguments return a tuple.Match.__getitem__(
g)Access groups with m[0], m[1] ...Match.groups(
default=None)Return a tuple containing all the subgroups of the matchMatch.groupdict(
default=None)Return a dictionary containing all the named subgroups of the match, keyed by the subgroup name.Match.start(
Regex Cheat Sheet Pdf
[group]
Match.end(
[group])Return the indices of the start and end of the substring matched by groupMatch.span(
[group])For a match m, return the 2-tuple
(m.start(group) m.end(group))Match.posThe value of pos which was passed to the search() or match() method of the regex objectMatch.endposLikewise but the value of endposMatch.lastindexThe integer index of the last matched capturing group, or None.Match.lastgroupThe name of the last matched capturing group or NoneMatch.reThe regular expression object whose match() or search() method produced this match instanceMatch.stringThe string passed to match() or search()Special escape characters
AMatch only at the start of the stringbMatch the empty string at the beginning or end of a wordBMatch the empty string when not at the beginning or end of a worddMatch any Unicode decimal digit this includes [0-9]DMatch any character which is not a decimal digitsMatch Unicode white space characters which includes [ tnrfv]SMatches any character which is not a whitespace character. The opposite of swMatch Unicode word characters including [a-zA-Z0-9_]WMatch the opposite of wZMatch only at the end of a stringRegular Expression Objects
Pattern.search(string[,
pos[,
endpos]]
)See
string[,
pos[,
endpos]])Likewise but see
string[,
pos[,
endpos]])Likewise but see
string,
maxsplit=0)Identical to
re.search(). pos gives an index where to start the search. endpos limits how far the string will be searched.Pattern.match(string[,
pos[,
endpos]])Likewise but see
re.match()Pattern.fullmatch(string[,
pos[,
endpos]])Likewise but see
re.fullmatch()Pattern.split(string,
maxsplit=0)Identical to
re.split()Pattern.findall
(
pattern,
repl,
string,
count=0,
flags=0)Like sub but return a tuple (new_string, number_of_subs_made)re.escape(
pattern)Escape special characters in patternre.purge()Clear the regular expression cache
template)Return the string obtained by doing backslash substitution on template, as done by the sub() methodMatch.group(
[group1,...])Returns one or more subgroups of the match. 1 Argument returns string and more arguments return a tuple.Match.__getitem__(
g)Access groups with m[0], m[1] ...Match.groups(
default=None)Return a tuple containing all the subgroups of the matchMatch.groupdict(
default=None)Return a dictionary containing all the named subgroups of the match, keyed by the subgroup name.Match.start(
[group]
Match.end(
[group])Return the indices of the start and end of the substring matched by groupMatch.span(
[group])For a match m, return the 2-tuple
string[,
pos[,
endpos]])See
string[,
pos[,
endpos]])Likewise but see
string[,
pos[,
endpos]])Likewise but see
string,
maxsplit=0)Identical to
string[,
pos[,
endpos]])Similar to
string[,
pos[,
endpos]])Similar to
repl,
string,
count=0)Identical to
repl,
string,
count=0)Identical to
This is useful if you wish to include the flags as part of the regular expression, instead of passing a flag argument to the re.compile() function
pattern,
repl,
string,
count=0,
flags=0)Like sub but return a tuple (new_string, number_of_subs_made)re.escape(
pattern)Escape special characters in patternre.purge()Clear the regular expression cache
Raw String Notation
In raw string notationr'text' there is no need to escape the backslash character again.>>> re.match(r'W(.)1W', ' ff ')>>> re.match('W(.)1W', ' ff ')Reference
https://docs.python.org/3/howto/regex.htmlhttps://docs.python.org/3/library/re.htmlExtensions
(?...)This is the start of an extension(?aiLmsux)The letters set the correspondig flags See flags(?:...)A non-capturing version of regular parantheses(?P...)Like regular paranthes but with a named group(?P=name)A backreference to a named group(?#...)A comment(?=...)lookahead assertion: Matches if ... matches next without consuming the string(?!...)negative lookahead assertion: Matches if ... doesn't match next(?<=....)positive lookbehind assertion: Match if the current position in the string is preceded by a match for ... that ends the current position(?<!...)negative lookbehind assertion: Match if the current position in the string is not preceded by a match for ...(?(id/name)yes-pattern|no-pattern)Match with yes-pattern if the group with gived id or name exists and with no-pattern if notMatch objects
Match.expand(template)Return the string obtained by doing backslash substitution on template, as done by the sub() methodMatch.group(
[group1,...])Returns one or more subgroups of the match. 1 Argument returns string and more arguments return a tuple.Match.__getitem__(
g)Access groups with m[0], m[1] ...Match.groups(
default=None)Return a tuple containing all the subgroups of the matchMatch.groupdict(
default=None)Return a dictionary containing all the named subgroups of the match, keyed by the subgroup name.Match.start(
Regex Cheat Sheet Pdf
[group]
Match.end(
[group])Return the indices of the start and end of the substring matched by groupMatch.span(
[group])For a match m, return the 2-tuple
(m.start(group) m.end(group))Match.posThe value of pos which was passed to the search() or match() method of the regex objectMatch.endposLikewise but the value of endposMatch.lastindexThe integer index of the last matched capturing group, or None.Match.lastgroupThe name of the last matched capturing group or NoneMatch.reThe regular expression object whose match() or search() method produced this match instanceMatch.stringThe string passed to match() or search()Special escape characters
AMatch only at the start of the stringbMatch the empty string at the beginning or end of a wordBMatch the empty string when not at the beginning or end of a worddMatch any Unicode decimal digit this includes [0-9]DMatch any character which is not a decimal digitsMatch Unicode white space characters which includes [ tnrfv]SMatches any character which is not a whitespace character. The opposite of swMatch Unicode word characters including [a-zA-Z0-9_]WMatch the opposite of wZMatch only at the end of a stringRegular Expression Objects
Pattern.search(string[,
pos[,
endpos]])See
re.search(). pos gives an index where to start the search. endpos limits how far the string will be searched.Pattern.match(string[,
pos[,
endpos]])Likewise but see
re.match()Pattern.fullmatch(string[,
pos[,
endpos]])Likewise but see
re.fullmatch()Pattern.split(string,
maxsplit=0)Identical to
re.split()Pattern.findall(string[,
pos[,
endpos]])Similar to
re.findall() but with additional parameters pos and endposPattern.finditer(string[,
pos[,
endpos]])Similar to
re.finditer() but with additional parameters pos and endposPattern.sub(repl,
string,
count=0)Identical to
re.sub()Pattern.subn(repl,
string,
count=0)Identical to
re.subn()Pattern.flagsThe regex matching flags.Pattern.groupsThe number of capturing groups in the patternPattern.groupindexA dictionary mapping any symbolic group names to group membersPattern.patternThe pattern string from which the pattern object was compiledThese objects are returned by the re.compile() methodFlags
ASCII, AASCII-only matching in w, b, s and dIGNORECASE, Iignore caseLOCALE, Ldo a local-aware matchMULTILINE, Mmultiline matching, affecting^ and $DOTALL, Sdot matches alluunicode matching (just in (?aiLmsux))VERBOSE, XverboseFlags are used in (?aiLmsux-imsx:...) or (?aiLmsux) or can be accessed with re.FLAG. In the first form flags are set or removed.This is useful if you wish to include the flags as part of the regular expression, instead of passing a flag argument to the re.compile() function
