Strip non alphabetic characters python

Question

It is advisable to use PyPi regex module if you plan to match specific Unicode property classes. This library has also proven to be more stable, especially handling large texts, and yields consistent results across various Python versions. All you need to do is to keep it up-to-date.

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Use the isalnum() Method to Remove All Non-Alphanumeric Characters in Python String
Use the filter() Function to Remove All Non-Alphanumeric Characters in Python String
Use Regular Expressions to Remove All Non-Alphanumeric Characters in Python String
Related Article - Python String
How do you remove non alphabetic characters from a string in Python?
How do I remove non alphabetic characters from a string?
How do you find non alphabetic characters in Python?
How do you remove characters other than alphanumeric?

If you install it (using pip install regex or pip3 install regex), you may use

import regex
print ( regex.sub(r'\P{L}+', '', 'ABCŁąć1-2!Абв3§4“5def”') )
// => ABCŁąćАбвdef

to remove all chunks of 1 or more characters other than Unicode letters from text. See an online Python demo. You may also use "".join(regex.findall(r'\p{L}+', 'ABCŁąć1-2!Абв3§4“5def”')) to get the same result.

In Python re, in order to match any Unicode letter, one may use the [^\W\d_] construct (Match any unicode letter?).

So, to remove all non-letter characters, you may either match all letters and join the results:

result = "".join(re.findall(r'[^\W\d_]', text))

Or, remove all chars matching the [\W\d_] pattern (opposite to [^\W\d_]):

result = re.sub(r'[\W\d_]+', '', text)

See the regex demo online. However, you may get inconsistent results across various Python versions because the Unicode standard is evolving, and the set of chars matched with \w will depend on the Python version. Using PyPi regex library is highly recommended to get consistent results.

HowTo
Python How-To's
Remove Non-Alphanumeric Characters From Python String

Created: May-28, 2021

Use the isalnum() Method to Remove All Non-Alphanumeric Characters in Python String
Use the filter() Function to Remove All Non-Alphanumeric Characters in Python String
Use Regular Expressions to Remove All Non-Alphanumeric Characters in Python String

Alphanumeric characters contain the blend of the 26 characters of the letter set and the numbers 0 to 9. Non-alphanumeric characters include characters that are not letters or digits, like + and @.

In this tutorial, we will discuss how to remove non-alphanumeric characters from a string in Python.

Use the isalnum() Method to Remove All Non-Alphanumeric Characters in Python String

We can use the isalnum() method to check whether a given character or string is alphanumeric or not. We can compare each character individually from a string, and if it is alphanumeric, then we combine it using the join() function.

For example,

string_value = "alphanumeric@123__"
s = ''.join(ch for ch in string_value if ch.isalnum())
print(s)

Output:

alphanumeric123

Use the filter() Function to Remove All Non-Alphanumeric Characters in Python String

The filter() function is used to construct an iterator from components of the iterable object and filters the object’s elements using a function.

For our problem, the string is our object, and we will use the isalnum() function, which checks whether a given string contains alphanumeric characters or not by checking each character. The join() function combines all the characters to return a string.

For example,

string_value = "alphanumeric@123__"
s = ''.join(filter(str.isalnum, string_value))
print(s)

Output:

alphanumeric123

This method does not work with Python 3.

Use Regular Expressions to Remove All Non-Alphanumeric Characters in Python String

A regular expression is an exceptional grouping of characters that helps you match different strings or sets of strings, utilizing a specific syntax in a pattern. To use regular expressions, we import the re module.

We can use the sub() function from this module to replace all the string that matches a non-alphanumeric character by an empty character.

For example,

import re
string_value = "alphanumeric@123__"
s=re.sub(r'[\W_]+', '', string_value)
print(s)

Output:

alphanumeric123

Alternatively, we can also use the following pattern.

import re
string_value = "alphanumeric@123__"
s = re.sub(r'[^a-zA-Z0-9]', '', string_value)
print(s)

Output:

alphanumeric123

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How do you remove non alphabetic characters from a string in Python?

Use the isalnum() Method to Remove All Non-Alphanumeric Characters in Python String. We can use the isalnum() method to check whether a given character or string is alphanumeric or not. We can compare each character individually from a string, and if it is alphanumeric, then we combine it using the join() function.

How do I remove non alphabetic characters from a string?

The approach is to use the String. replaceAll method to replace all the non-alphanumeric characters with an empty string.

How do you find non alphabetic characters in Python?

Python isalnum That's where isalnum() can be helpful. isalnum() is a built-in Python function that checks whether all characters in a string are alphanumeric. In other words, isalnum() checks whether a string contains only letters or numbers or both.

How do you remove characters other than alphanumeric?

We can remove non-alphanumeric characters from the string with preg_replace() function in PHP. The preg_replace() function is an inbuilt function in PHP which is used to perform a regular expression for search and replace the content.

programming python Re replace Python

Strip non alphabetic characters python

Use the isalnum() Method to Remove All Non-Alphanumeric Characters in Python String

Use the filter() Function to Remove All Non-Alphanumeric Characters in Python String

Use Regular Expressions to Remove All Non-Alphanumeric Characters in Python String

Related Article - Python String

How do you remove non alphabetic characters from a string in Python?

How do I remove non alphabetic characters from a string?

How do you find non alphabetic characters in Python?

How do you remove characters other than alphanumeric?

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