Tilde operator in Regular expressions

by

In this case, it’s just being used as a delimiter.

Generally, in PHP, the first and last characters of a regular expression are “delimiters” to mark the start and ending position of a matching portion (in case you want to add modifiers at the end, like ungreedy, etc)

Generally PHP works this out from the first character in a string that is meant as a regular expression, matching the second occurence of it as the second delimiter. This is useful where you have an occurrence of the normal delimiter in the text (for example, occurences of / in the text) – this means you don’t have to do awkward things.

Matching for “//” with the delimiter set to “/“

/\/\//

Matching for “//” with the delimiter of “#“

#//#

More Related Contents:

  1. Matching Unicode letter characters in PCRE/PHP
  2. PHP regular expressions: No ending delimiter ‘^’ found in
  3. php regex to match outside of html tags
  4. “vertical” regex matching in an ASCII “image”
  5. Match a^n b^n c^n (e.g. “aaabbbccc”) using regular expressions (PCRE)
  6. PHP Regex: How to match \r and \n without using [\r\n]?
  7. Extra backslash needed in PHP regexp pattern
  8. What literal characters should be escaped in a regex?
  9. RegEx BackReference to Match Different Values
  10. php regex word boundary matching in utf-8
  11. How do I match accented characters with PHP preg?
  12. How to find value between commas
  13. How to validate an email address in PHP
  14. How to validate an Email in PHP?
  15. deny direct access to a folder and file by htaccess
  16. parse youtube video id using preg_match [duplicate]
  17. How can I convert ereg expressions to preg in PHP?
  18. Convert plain text URLs into HTML hyperlinks in PHP
  19. Regular expression pattern to match URL with or without http://www
  20. What Delimiter to use for preg_replace in PHP (replace working outside of PHP but not inside)
  21. Parsing CSS by regex
  22. Remove repeating character
  23. Replace only first match using preg_replace [duplicate]
  24. Get the price of an item on Steam Community Market with PHP and Regex
  25. How to prefix a positive number with plus sign in PHP
  26. Converting Javascript Regex to PHP
  27. Extract floating point numbers from a delimited string in 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