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Using string methods and regexes in pythonPhoto by Karolina Grabowska from PexelsReplace Occurrences of Substrings in Strings in Python
By using the above-mentioned methods, let’s see how to replace substrings in strings. 1. Replace all occurrences of substring‘Using str.replace()’Syntax: Example 1: Replace substring “two” by “one” s1="one apple,two orange,two banana" By default, str.replace() will replace all occurrences of “two” by “one” 2. Replace only the first occurrence of a substringUsing ‘str.replace’Example 1: Replace substring “two” by “one” for first occurrence only. If we want to replace the substring by the first occurrence only, we can mention count =1. Likewise, for the first two occurrences, we can mention count=2. s1="one apple,two orange,two banana" 3. Case-insensitive replacement.Using ‘re.sub()’Syntax:
By mentioning Example 1: Have to replace “An” or “an” by “one”. import re
Example 2: Doing case insensitive replacement by using re.subn() Using ‘re.subn()’Syntax : Same as re.sub(), but it will return a tuple (new_string, number_of_subs_made) If we want to know the number of substitutions made, re.subn() can be used. import re
4. Avoid replacement on parts of words.Example 1: To replace “an” by “one”. But it should not replace parts of words. If we use str.replace(), “an” inside “orange” also gets replaced. s1="an apple,an orange" To avoid replacement on parts on words, re.sub() can be used. import re
5.Replace multiple words by one word.Example 1: Repalce “hr”, “hour” to “Hours” import re
6. Replace a specific set of characters by a single character.Example: Replace @,#,$,% by ‘-’ import re
7. Replace one or more occurrences of a character by a single character.import re
Using ‘re.subn() import re My other blogs related to string methodsHow do you replace all occurrences of substring in a string?To replace all occurrences of a substring in a string by a new one, you can use the replace() or replaceAll() method: replace() : turn the substring into a regular expression and use the g flag.
How do you replace multiple items in a string in Python?Replace Multiple Characters in a String in Python. Use str.replace() to Replace Multiple Characters in Python.. Use re.sub() or re.subn() to Replace Multiple Characters in Python.. translate() and maketrans() to Replace Multiple Characters in Python.. Is there a replace all function in Python?The replace() method is a built-in functionality offered in Python programming. It replaces all the occurrences of the old substring with the new substring. Replace() returns a new string in which old substring is replaced with the new substring.
How do I remove all occurrences from a substring in Python?Remove All Occurrences of a Character From a String in Python Using the filter() Function. We can also use the filter() function with the join() method and lambda function to remove the occurrences of a character from a string in Python.
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