regex - How to remove blank lines from text in PHP?

Regex - How to remove blank lines from text in PHP?

To remove blank lines from text in PHP, you can use the preg_replace function with a regular expression pattern. Here's how you can do it:

<?php // Your input text $text = "This is some text\n\nwith blank lines\n\n"; // Define the pattern to match blank lines $pattern = "/^\s*$/m"; // Remove blank lines using preg_replace $result = preg_replace($pattern, "", $text); // Print the result echo $result; ?>

Explanation:

  • /^\s*$/m is the regular expression pattern.
    • ^ asserts the start of the line.
    • \s* matches zero or more whitespace characters.
    • $ asserts the end of the line.
    • /m flag enables multi-line mode, allowing ^ and $ to match the start and end of each line in the text.
  • preg_replace($pattern, "", $text) replaces all matches of the pattern with an empty string, effectively removing them.

This will remove all blank lines from the input text and print the result. Adjust the $text variable according to your specific requirements.

Examples

  1. "PHP regex remove empty lines from text"

    • Description: This query focuses on using regular expressions in PHP to remove empty lines from text.
    • Code Implementation:
      <?php $text = "Line 1\n\nLine 2\n\n\nLine 3"; $clean_text = preg_replace("/(^[\r\n]*|[\r\n]+)[\s\t]*[\r\n]+/", "\n", $text); echo $clean_text; ?>

  2. "PHP remove blank lines with regex"

    • Description: This query aims to remove blank lines from text in PHP using regular expressions.
    • Code Implementation:
      <?php $text = "Line 1\n\nLine 2\n\n\nLine 3"; $clean_text = preg_replace('/^\h*\v+/m', '', $text); echo $clean_text; ?>

  3. "PHP regex to delete empty lines in text"

    • Description: This query targets using regex in PHP to delete empty lines from text content.
    • Code Implementation:
      <?php $text = "Line 1\n\nLine 2\n\n\nLine 3"; $clean_text = preg_replace('/^\s*[\r\n]/m', '', $text); echo $clean_text; ?>

  4. "PHP remove empty lines from string using regex"

    • Description: This query involves removing empty lines from a string in PHP using regex.
    • Code Implementation:
      <?php $text = "Line 1\n\nLine 2\n\n\nLine 3"; $clean_text = preg_replace('/^\h*\v+/m', '', $text); echo $clean_text; ?>

  5. "PHP regex delete blank lines from text"

    • Description: This query focuses on deleting blank lines from text using regular expressions in PHP.
    • Code Implementation:
      <?php $text = "Line 1\n\nLine 2\n\n\nLine 3"; $clean_text = preg_replace('/^\s*[\r\n]/m', '', $text); echo $clean_text; ?>

  6. "PHP regex clean text by removing empty lines"

    • Description: This query is about cleaning text by removing empty lines using regex in PHP.
    • Code Implementation:
      <?php $text = "Line 1\n\nLine 2\n\n\nLine 3"; $clean_text = preg_replace('/(^[\r\n]*|[\r\n]+)[\s\t]*[\r\n]+/', "\n", $text); echo $clean_text; ?>

  7. "PHP delete empty lines from text using regular expressions"

    • Description: This query involves deleting empty lines from text using regular expressions in PHP.
    • Code Implementation:
      <?php $text = "Line 1\n\nLine 2\n\n\nLine 3"; $clean_text = preg_replace('/^\s*[\r\n]/m', '', $text); echo $clean_text; ?>

  8. "PHP regex to strip blank lines from text"

    • Description: This query focuses on using regex to strip blank lines from text in PHP.
    • Code Implementation:
      <?php $text = "Line 1\n\nLine 2\n\n\nLine 3"; $clean_text = preg_replace('/^\h*\v+/m', '', $text); echo $clean_text; ?>

  9. "PHP regex for removing empty lines in string"

    • Description: This query aims to remove empty lines from a string using regex in PHP.
    • Code Implementation:
      <?php $text = "Line 1\n\nLine 2\n\n\nLine 3"; $clean_text = preg_replace('/(^[\r\n]*|[\r\n]+)[\s\t]*[\r\n]+/', "\n", $text); echo $clean_text; ?>

  10. "PHP regex to eliminate blank lines from text"

    • Description: This query involves using regex to eliminate blank lines from text in PHP.
    • Code Implementation:
      <?php $text = "Line 1\n\nLine 2\n\n\nLine 3"; $clean_text = preg_replace('/(^[\r\n]*|[\r\n]+)[\s\t]*[\r\n]+/', "\n", $text); echo $clean_text; ?>

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