How to Split By Newline And Ignore Blank Lines Using Regex?

To split by newline and ignore blank lines using regex, you can use the following pattern: /\S+/g. This regex pattern matches one or more non-whitespace characters, effectively splitting the input string by newline characters and ignoring blank lines. For example, if you have the following input string:

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Line 1
Line 2

Line 3

Line 4

You can use the regex pattern /\S+/g to split it into an array of non-blank lines:

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["Line 1",
 "Line 2",
 "Line 3",
 "Line 4"]

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How to remove empty lines from a string using regex?

In Python, you can remove empty lines from a string using the re.sub() function from the re module.

Here's an example code snippet to remove empty lines from a string using regex:

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import re

# Sample string with empty lines
text = 'Hello\n\nWorld\n\n\nHow are you?'

# Remove empty lines using regex
clean_text = re.sub(r'\n\s*\n', '\n', text)

print(clean_text)

Output:

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Hello
World
How are you?

In the regex pattern r'\n\s*\n',

• \n matches a newline character,
• \s* matches zero or more whitespace characters,
• the overall pattern matches one or more whitespace characters in between two newline characters.

The re.sub() function replaces this pattern with just a single newline character, effectively removing the empty lines from the string.

What is the equivalent of new line in regex?

In regex, the equivalent of a new line is represented by the special character \n or [\r\n].

How to split a text file by newline using regex in Python?

You can split a text file by newline using regex in Python by using the re.split() function from the re module. Here's an example code snippet to split a text file by newline using regex:

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import re

# Read the text file
with open('file.txt', 'r') as file:
    text = file.read()

# Split the text file by newline using regex
lines = re.split(r'\n', text)

# Print the lines
for line in lines:
    print(line)

In this code snippet, we first read the text file using the open() function and then store the contents of the file in the text variable. We then split the text file by newline using the regex pattern \n with the re.split() function. Finally, we loop through each line in the lines list and print them.

Make sure to replace 'file.txt' with the path to your text file that you want to split by newline.