PHP regular expression to match lines starting with a special character

by

You forgot the multiline modifier (and you should not use the singleline modifier; also the case-insensitive modifier is unnecessary as well as the ungreedy modifier):

preg_match_all("/^#(.*)$/m",$text,$m);

Explanation:

  • /m allows the ^ and $ to match at the start/end of lines, not just the entire string (which you need here)
  • /s allows the dot to match newlines (which you don’t want here)
  • /i turns on case-insensitive matching (which you don’t need here)
  • /U turns on ungreedy matching (which doesn’t make a difference here because of the anchors)

A PHP code demo:

$text = "1st line\n#test line this \nline #new line\naaaa #aaaa\nbbbbbbbbbbb#\ncccccccccccc\n#ddddddddd"; 
preg_match_all("/^#(.*)$/m",$text,$m);
print_r($m[0]);

Results:

[0] => #test line this 
[1] => #ddddddddd

More Related Contents:

  1. Turn Plain Text URLs into Active Links using PHP [closed]
  2. I need php regular expression to allow the all leters, numbers, dollar sign, commas, double & single quotes [closed]
  3. How to find value between commas
  4. How to validate an email address in PHP
  5. How to validate an Email in PHP?
  6. deny direct access to a folder and file by htaccess
  7. parse youtube video id using preg_match [duplicate]
  8. Convert plain text URLs into HTML hyperlinks in PHP
  9. Remove style attribute from HTML tags
  10. “vertical” regex matching in an ASCII “image”
  11. Regular expression pattern to match URL with or without http://www
  12. Match a^n b^n c^n (e.g. “aaabbbccc”) using regular expressions (PCRE)
  13. RegExp to strip HTML comments
  14. What Delimiter to use for preg_replace in PHP (replace working outside of PHP but not inside)
  15. Parsing CSS by regex
  16. Remove repeating character
  17. Codeigniter Routes regex – using dashes in controller/method names
  18. Change single variable value in querystring [closed]
  19. How to check, if a php string contains only english letters and digits?
  20. php regex to get string inside href tag
  21. Tilde operator in Regular expressions
  22. Explode string by one or more spaces or tabs
  23. How to prefix a positive number with plus sign in PHP
  24. Regex / DOMDocument – match and replace text not in a link
  25. Converting Javascript Regex to PHP
  26. Extract floating point numbers from a delimited string in PHP
  27. Parse math operations with PHP
  28. How to remove all numbers from string?
  29. Regular expression preg_quote symbols are not detected
  30. Detecting a url using preg_match? without http:// in the string

Leave a Comment