![python regular expression not python regular expression not](https://cdn.educba.com/academy/wp-content/uploads/2020/01/Regular-Expression-in-Python.jpg)
Print("Now we have replaced all the spaces and have only digits in the given string is as follows:")Įxplanation: In the above program, we can see that we have a string with a variable name “phonenum”, which we have a string with phone number also, but we need only digits for obtaining proper phone number. Print("The correct phone number by removing special characters in the given string which means replacing them by space is as follows:")Ĭorrect_num2 = re.sub(r'\D', "", phonenum) Print("The below program is used to demonstrate sub() method:") Now let us see an example below that uses this sub() method: This method returns the modified string after the replacement of the string is done. This sub() method is used to replace all the given “re” pattern in the string, which is in the replc parameter and substituting all occurrences unless the max value is specified.
![python regular expression not python regular expression not](https://www.edureka.co/blog/wp-content/uploads/2019/02/Picture1-3.png)
replc: This parameter is for replacing the part of the string that is specified.pattern: In this, we write the pattern to be searched in the given string.Re.sub( pattern, replc, string, max = 0) Parameters of Python regex replaceīelow are the parameters of Python regex replace: Now let us the proper syntax and example of the sub()method below. So we need to replace special characters “#!!” with white space so that the given string is readable. str = Educba#!!Training#!!Institute this string needs to be modified with the string that should contain only the string and not special characters. Print("The string obtained after replacing special character with space is as follows:")Įxplanation: In the above program, we can see that we have a simple string with some special characters in it. Print("The given string that needs to be replaced with given pattern is as follows:") Print("The simple program for sub() method for replacing:") Example of Python regex replaceīelow is an example of Python regex replace:
![python regular expression not python regular expression not](https://media.geeksforgeeks.org/wp-content/uploads/20190529134204/Search_12.jpg)
This sub() method takes input as a pattern as substring to replace and substring to replace with and the original string that needs to be modified. $ this is used to match the end of the line. ^ this is used to match the starting of the line.Ħ. Some of the metacharacters are given as below:ĥ. In python, there are provided with meta characters to write regular expressions. This is one of the most important methods in the re module that uses regular expressions. In Python, a common task is to find and replace a part of a string with some specified patterns using regular expressions, so to do this, we have to use the sub() method. In this article, we are discussing how regular expression is used for replacing string or substring.
Python regular expression not how to#
So before searching or replacing any string, we should know how to write regular expressions with known Meta characters that are used for writing patterns. In Python, regular expressions use the “re” module when there is a need to match or search or replace any part of a string with some specified pattern. In Python, strings can be replaced using replace() function, but when we want to replace some parts of a string instead of the entire string, then we use regular expressions in Python, which is mainly used for searching and replacing the patterns given with the strings that need to be replaced. In this article, we are discussing regular expression in Python with replacing concepts.