Home > Backend Development > PHP Tutorial > How to Fix the 'Delimiter must not be alphanumeric or backslash' Error in PHP's `preg_match`?

How to Fix the 'Delimiter must not be alphanumeric or backslash' Error in PHP's `preg_match`?

DDD
Release: 2024-12-05 00:38:09
Original
273 people have browsed it

How to Fix the

Delimiter Issue in preg_match

When encountering the error "Delimiter must not be alphanumeric or backslash," it indicates a missing delimiter in your regular expression.

The provided code attempts to extract the name between single quotes from a string using preg_match. However, the regular expression requires a delimiter to define the boundaries of the pattern.

Solution

Add a delimiter to the regular expression. Commonly used delimiters include forward slash (/), pound (#), and backtick (`). In this case, we'll use a forward slash:

$pattern = "/My name is '(.*)' and im fine/";
Copy after login

By enclosing the pattern with forward slashes, we properly define the start and end of the pattern, preventing the error you encountered.

Updated Code

$string1 = "My name is 'Kate' and im fine";
$pattern = "/My name is '(.*)' and im fine/";
preg_match($pattern, $string1, $matches);
echo $matches[1]; // Output: Kate
Copy after login

This updated code will successfully extract and display the name enclosed in single quotes. Remember, when defining a regular expression pattern, it's essential to include a valid delimiter to avoid parsing errors.

The above is the detailed content of How to Fix the 'Delimiter must not be alphanumeric or backslash' Error in PHP's `preg_match`?. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template