Cara menggunakan python regex delete match

A special sequence is a \ followed by one of the characters in the list below, and has a special meaning:

CharacterDescriptionExampleTry it\AReturns a match if the specified characters are at the beginning of the string"\AThe"Try it »\bReturns a match where the specified characters are at the beginning or at the end of a word
(the "r" in the beginning is making sure that the string is being treated as a "raw string")r"\bain"
r"ain\b"Try it »
Try it »\BReturns a match where the specified characters are present, but NOT at the beginning (or at the end) of a word
(the "r" in the beginning is making sure that the string is being treated as a "raw string")r"\Bain"
r"ain\B"Try it »
Try it »\dReturns a match where the string contains digits (numbers from 0-9)"\d"Try it »\DReturns a match where the string DOES NOT contain digits"\D"Try it »\sReturns a match where the string contains a white space character"\s"Try it »\SReturns a match where the string DOES NOT contain a white space character"\S"Try it »\wReturns a match where the string contains any word characters (characters from a to Z, digits from 0-9, and the underscore _ character)"\w"Try it »\WReturns a match where the string DOES NOT contain any word characters"\W"Try it »\ZReturns a match if the specified characters are at the end of the string"Spain\Z"Try it »

Sets

A set is a set of characters inside a pair of square brackets [] with a special meaning:

SetDescriptionTry it[arn]Returns a match where one of the specified characters (a, r, or n) is presentTry it »[a-n]Returns a match for any lower case character, alphabetically between a and nTry it »[^arn]Returns a match for any character EXCEPT a, r, and nTry it »[0123]Returns a match where any of the specified digits (re4, re5, re6, or re7) are presentTry it »[0-9]Returns a match for any digit between re4 and re9Try it »[0-5][0-9]Returns a match for any two-digit numbers from re0 and re1Try it »[a-zA-Z]Returns a match for any character alphabetically between a and re3, lower case OR upper caseTry it »[+]In sets, re4, re5, re6, re7, re8, re9,re0 has no special meaning, so re1 means: return a match for any re4 character in the stringTry it »

The findall() Function

The re3 function returns a list containing all matches.

Example

Print a list of all matches:

import re

txt = "The rain in Spain"
x = re.findall("ai", txt)
print(x)

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The list contains the matches in the order they are found.

If no matches are found, an empty list is returned:

Example

Return an empty list if no match was found:

import re

txt = "The rain in Spain"
x = re.findall("Portugal", txt)
print(x)

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The search() Function

The re4 function searches the string for a match, and returns a if there is a match.

If there is more than one match, only the first occurrence of the match will be returned:

Example

Search for the first white-space character in the string:

import re

txt = "The rain in Spain"
x = re.search("\s", txt)

print("The first white-space character is located in position:", x.start())

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If no matches are found, the value re5 is returned:

Example

Make a search that returns no match:

import re

txt = "The rain in Spain"
x = re.search("Portugal", txt)
print(x)

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The split() Function

The re6 function returns a list where the string has been split at each match:

Example

Split at each white-space character:

import re

txt = "The rain in Spain"
x = re.split("\s", txt)
print(x)

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You can control the number of occurrences by specifying the re7 parameter:

Example

Split the string only at the first occurrence:

import re

txt = "The rain in Spain"
x = re.split("\s", txt, 1)
print(x)

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The sub() Function

The re8 function replaces the matches with the text of your choice:

Example

Replace every white-space character with the number 9:

import re

txt = "The rain in Spain"
x = re.sub("\s", "9", txt)
print(x)

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You can control the number of replacements by specifying the re9 parameter:

Example

Replace the first 2 occurrences:

import re

txt = "The rain in Spain"
x = re.sub("\s", "9", txt, 2)
print(x)

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Match Object

A Match Object is an object containing information about the search and the result.

Note: If there is no match, the value re5 will be returned, instead of the Match Object.

Example

Do a search that will return a Match Object:

import re

txt = "The rain in Spain"
x = re.search("ai", txt)
print(x) #this will print an object

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The Match object has properties and methods used to retrieve information about the search, and the result: