How to convert a php string into an array using regular expressions

Preg_split() can be used with regular expressions to convert strings into arrays in php. The syntax is "preg_split('regular', string, -1, PREG_SPLIT_OFFSET_CAPTURE)"; this function uses a regular expression to Separate a string and store the separated substrings into an array.

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

In php, you can use preg_split () function works with regular expressions to convert strings into arrays.

Example: Use regular matches to match spaces, use it as a separator, split the string into a substring and store it in an array

<?php
$str = &#39;hypertext language programming&#39;;
var_dump($str);
$chars = preg_split(&#39;/ /&#39;, $str, -1, PREG_SPLIT_OFFSET_CAPTURE);
var_dump($chars);
?>

Description: preg_split() function separates strings through a regular expression

preg_split ( string $pattern , string $subject [, int $limit = -1 [, int $flags = 0 ]] )

The parameter description is as follows:

• pattern: The pattern used for matching, that is, the regular expression.
• subject: The string to be separated.
• limit: Optional parameter. If specified, the substrings obtained by limiting the separation will be limited to at most limit, and the last substring will contain all remaining parts. When the limit value is -1, 0 or NULL, it means "no limit". It is recommended to use NULL.
• flags: optional parameter, which has 3 values.
  •             If set to PREG_SPLIT_NO_EMPTY, preg_split() will return the separated non-empty portion.
  •             If set to PREG_SPLIT_DELIM_CAPTURE, bracket expressions in delimited patterns are captured and returned.
  •             If set to PREG_SPLIT_OFFSET_CAPTURE, the string offset will be appended to the return for each occurrence of a match.

            Note: This will change each element in the returned array so that each element becomes an array consisting of the 0th element being the separated substring and the 1st element being the offset of the substring in the subject. .

Note: This will change each element in the returned array so that each element becomes a substring separated by the 0th element and the 1st element. The element is an array consisting of the offset of the substring in the subject.

Return value: Returns an array composed of substrings obtained after splitting the subject string using pattern.

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