![]() ![]() Use $n to reference a capturing group, where n is the capturing group number.The following shows how to use the preg_replace() function to swap the first name and last name and place a comma between them: immediately after the opening parentheses (?. The $1 references the capturing group for the first name and $2 references the capturing group for the last name. Since the pattern contains the forward-slash ( /), it’s more readable to use the curly braces as the delimiters to form the regular expression: "' Code language: JavaScript ( javascript ) To match this URI, you can use the following pattern: \w+/\d+ Code language: PHP ( php ) The resource name is a string, while the resource id is an integer. And while there is a lot of theory behind formal languages, the following lessons and examples will explore the more practical uses of regular expressions so that you can. The URI has a resource name ( posts) and id ( 25). Regular expressions are extremely useful in extracting information from text such as code, log files, spreadsheets, or even documents. Suppose you have a URI with the following format: 'posts/25' Code language: PHP ( php ) Introduction to the regex capturing groups ![]() Perl is widely renowned for excellence in text processing, and regular expressions are one of the big factors behind this fame. ![]() Summary: in this tutorial, you will learn how to use the regex capturing groups to group and capture parts of a match. Regular expressions are an integral part of the m//, s///, qr// and split operators and so this tutorial also overlaps with 'Regexp Quote-Like Operators' in perlop and 'split' in perlfunc. ![]()
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