Split string with delimiter in python

How to Split String with Multiple Delimiters in Python

Here are the ways to split a string with multiple delimiters in Python.

1. Using the “re.split()” method
2. Using the “functools.reduce()” function with “list comprehension”
3. Using the “str.split()” method with a custom function

Method 1: Using the re.split() method

To split a string with a single delimiter in Python, you can use the “re.split()” method. The re.split() method allows you to split a string based on a pattern, which can include multiple delimiters.

Example

import re input_string = "This is an;example,string:with.multiple|delimiters" delimiters = ";|,|:|\\.|\\|" split_string = re.split(delimiters, input_string) print(split_string)

['This is an', 'example', 'string', 'with', 'multiple', 'delimiters']

In this example, the input string is split into a list of substrings based on the specified delimiters.

Method 2: Using functools.reduce() with list comprehension

You can use the split() in combination with a for loop, functools.reduce() method, and list comprehension.

Example

from functools import reduce def multi_split(input_string, delimiters): if not delimiters: return [input_string] def _split_by_delimiter(string, delimiter): return [substring for segment in string for substring in segment.split(delimiter)] return reduce(_split_by_delimiter, delimiters, [input_string]) input_string = "This is an;example,string:with.multiple|delimiters" delimiters = [';', ',', ':', '.', '|'] split_string = multi_split(input_string, delimiters) print(split_string) 

['This is an', 'example', 'string', 'with', 'multiple', 'delimiters']

Method 3: Using the str.split() method with custom function

The str.split() method is a built-in Python method for splitting a string into a list of substrings based on a specified delimiter. If the delimiter is not provided, the method splits the string based on whitespace characters (spaces, tabs, and newlines).

However, the str.split() method does not directly support multiple delimiters. To achieve this, you can create a custom function that uses the str.split() method in a loop over the delimiters.

Example

def multi_split(input_string, delimiters): segments = [input_string] for delimiter in delimiters: new_segments = [] for segment in segments: new_segments.extend(segment.split(delimiter)) segments = new_segments return segments input_string = "This is an;example,string:with.multiple|delimiters" delimiters = [';', ',', ':', '.', '|'] split_string = multi_split(input_string, delimiters) print(split_string)

['This is an', 'example', 'string', 'with', 'multiple', 'delimiters']

In this example, the multi_split() function accepts an input string and a list of delimiters. Then, it iteratively splits the input string using each delimiter and accumulates the result in the segments list.

Источник

Python String split() Method

Split a string into a list where each word is a list item:

txt = «welcome to the jungle»

Definition and Usage

The split() method splits a string into a list.

You can specify the separator, default separator is any whitespace.

Note: When maxsplit is specified, the list will contain the specified number of elements plus one.

Syntax

Parameter Values

Parameter	Description
separator	Optional. Specifies the separator to use when splitting the string. By default any whitespace is a separator
maxsplit	Optional. Specifies how many splits to do. Default value is -1, which is «all occurrences»

More Examples

Example

Split the string, using comma, followed by a space, as a separator:

txt = «hello, my name is Peter, I am 26 years old»

Example

Use a hash character as a separator:

Example

Split the string into a list with max 2 items:

# setting the maxsplit parameter to 1, will return a list with 2 elements!
x = txt.split(«#», 1)

COLOR PICKER

Report Error

If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail:

Thank You For Helping Us!

Your message has been sent to W3Schools.

Top Tutorials

Top References

Top Examples

Get Certified

W3Schools is optimized for learning and training. Examples might be simplified to improve reading and learning. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. While using W3Schools, you agree to have read and accepted our terms of use, cookie and privacy policy.

Источник

Split string with delimiter in python

Last updated: Feb 24, 2023
Reading time · 4 min

# Split a string with multiple delimiters in Python

To split a string with multiple delimiters:

1. Use the re.split() method, e.g. re.split(r’,|-‘, my_str) .
2. The re.split() method will split the string on all occurrences of one of the delimiters.

Copied! 
import re # 👇️ split string with 2 delimiters my_str = 'bobby,hadz-dot,com' my_list = re.split(r',|-', my_str) # 👈️ split on comma or hyphen print(my_list) # 👉️ ['bobby', 'hadz', 'dot', 'com'] 

The re.split method takes a pattern and a string and splits the string on each occurrence of the pattern.

The pipe | character is an OR . Either match A or B .

The example splits a string using 2 delimiters — a comma and a hyphen.

Copied! 
# 👇️ split string with 3 delimiters my_str = 'bobby,hadz-dot:com' my_list = re.split(r',|-|:', my_str) # 👈️ comma, hyphen or colon print(my_list) # 👉️ ['bobby', 'hadz', 'dot', 'com'] 

Here is an example that splits the string using 3 delimiters — a comma, a hyphen and a colon.

You can use as many | characters as necessary in your regular expression.

# Split a string based on multiple delimiters using square brackets []

Alternatively, you can use square brackets [] to indicate a set of characters.

Copied! 
import re my_str = 'bobby,hadz-dot,com' my_list = re.split(r'[,-]', my_str) print(my_list) # 👉️ ['bobby', 'hadz', 'dot', 'com'] 

Make sure to add all of the delimiters between the square brackets.

Copied! 
import re # 👇️ split string with 3 delimiters my_str = 'bobby,hadz-dot:com' my_list = re.split(r'[,-:]', my_str) print(my_list) # 👉️ ['bobby', 'hadz', 'dot', 'com'] 

You might get empty string values in the output list if the string starts with or ends with one of the delimiters.

# Handling leading or trailing delimiters

You can use a list comprehension to remove any empty strings from the list.

Copied! 
import re # 👇️ split string with 3 delimiters my_str = ',bobby,hadz-dot:com:' my_list = [ item for item in re.split(r'[,-:]', my_str) if item ] print(my_list) # 👉️ ['bobby', 'hadz', 'dot', 'com'] 

The list comprehension takes care of removing the empty strings from the list.

List comprehensions are used to perform some operation for every element or select a subset of elements that meet a condition.

An alternative approach is to use the str.replace() method.

# Split a string with multiple delimiters using str.replace()

This is a two-step process:

1. Use the str.replace() method to replace the first delimiter with the second.
2. Use the str.split() method to split the string by the second delimiter.

Copied! 
my_str = 'bobby_hadz!dot_com' my_list = my_str.replace('_', '!').split('!') print(my_list) # 👉️ ['bobby', 'hadz', 'dot', 'com'] 

First, we replace every occurrence of the first delimiter with the second, and then we split on the second delimiter.

The str.replace method returns a copy of the string with all occurrences of a substring replaced by the provided replacement.

The method takes the following parameters:

Name	Description
old	The substring we want to replace in the string
new	The replacement for each occurrence of old
count	Only the first count occurrences are replaced (optional)

Note that the method doesn’t change the original string. Strings are immutable in Python.

Copied! 
my_str = 'bobby hadz, dot # com. abc' my_list = my_str.replace( ',', '').replace( '#', '').replace('.', '').split() print(my_list) # 👉️ ['bobby', 'hadz', 'dot', 'com', 'abc'] 

We used the str.replace() method to remove the punctuation before splitting the string on whitespace characters.

You can chain as many calls to the str.replace() method as necessary.

The last step is to use the str.split() method to split the string into a list of words.

The str.split() method splits the string into a list of substrings using a delimiter.

The method takes the following 2 parameters:

Name	Description
separator	Split the string into substrings on each occurrence of the separator
maxsplit	At most maxsplit splits are done (optional)

When no separator is passed to the str.split() method, it splits the input string on one or more whitespace characters.

Copied! 
my_str = 'bobby hadz com' print(my_str.split()) # 👉️ ['bobby', 'hadz', 'com'] 

If the separator is not found in the string, a list containing only 1 element is returned.

# Split a string based on multiple delimiters with a reusable function

If you need to split a string based on multiple delimiters often, define a reusable function.

Copied! 
import re def split_multiple(string, delimiters): pattern = '|'.join(map(re.escape, delimiters)) return re.split(pattern, string) my_str = 'bobby,hadz-dot:com' print(split_multiple(my_str, [',', '-', ':'])) 

The split_multiple function takes a string and a list of delimiters and splits the string on the delimiters.

The str.join() method is used to join the delimiters with a pipe | separator.

This creates a regex pattern that we can use to split the string based on the specified delimiters.

If you need to split a string into a list of words with multiple delimiters, you can also use the re.findall() method.

# Additional Resources

You can learn more about the related topics by checking out the following tutorials:

I wrote a book in which I share everything I know about how to become a better, more efficient programmer.

Источник