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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 the first occurrence of a character in a string in Python?If we want to replace only the first occurrences of a substring in a string with another character or sub-string, then we need to pass the count argument as 1 in the replace() function, sample_str = "This is a sample string, where is need to be replaced."
How do you replace the first occurrence of a character in a string?Use the replace() method to replace the first occurrence of a character in a string. The method takes a regular expression and a replacement string as parameters and returns a new string with one or more matches replaced.
How do you replace all occurrences of a character in a string in Python?The replace() method
replace() is a built-in method in Python that replaces all the occurrences of the old character with the new character.
How do you get the first occurrence of a word in a string in Python?Use the find() Function to Find First Occurrence in Python
We can use the find() function in Python to find the first occurrence of a substring inside a string. The find() function takes the substring as an input parameter and returns the first starting index of the substring inside the main string.
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