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Full Discussion: Regex learning.
Top Forums Shell Programming and Scripting Regex learning. Post 303044651 by acascianelli on Friday 28th of February 2020 09:29:10 PM
Old 02-28-2020
Not sure if this would be useful for you, but I found this tool a while back and it comes in handy when having to deal with regular expressions:

Expresso Regular Expression Tool
 

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SPLITI(3)								 1								 SPLITI(3)

spliti - Split string into array by regular expression case insensitive

SYNOPSIS
array spliti (string $pattern, string $string, [int $limit = -1]) DESCRIPTION
Splits a $string into array by regular expression. This function is identical to split(3) except that this ignores case distinction when matching alphabetic characters. Warning This function has been DEPRECATED as of PHP 5.3.0. Relying on this feature is highly discouraged. PARAMETERS
o $pattern - Case insensitive regular expression. If you want to split on any of the characters which are considered special by regular expressions, you'll need to escape them first. If you think spliti(3) (or any other regex function, for that matter) is doing something weird, please read the file regex.7, included in the regex/ subdirectory of the PHP distribution. It's in manpage for- mat, so you'll want to do something along the lines of man /usr/local/src/regex/regex.7 in order to read it. o $string - The input string. o $limit - If $limit is set, the returned array will contain a maximum of $limit elements with the last element containing the whole rest of $string. RETURN VALUES
Returns an array of strings, each of which is a substring of $string formed by splitting it on boundaries formed by the case insensitive regular expression $pattern. If there are n occurrences of $pattern, the returned array will contain n+1 items. For example, if there is no occurrence of $pattern, an array with only one element will be returned. Of course, this is also true if $string is empty. If an error occurs, spliti(3) returns FALSE. EXAMPLES
This example splits a string using 'a' as the separator : Example #1 spliti(3) example <?php $string = "aBBBaCCCADDDaEEEaGGGA"; $chunks = spliti ("a", $string, 5); print_r($chunks); ?> The above example will output: Array ( [0] => [1] => BBB [2] => CCC [3] => DDD [4] => EEEaGGGA ) NOTES
Note As of PHP 5.3.0, the regex extension is deprecated in favor of the PCRE extension. Calling this function will issue an E_DEPRECATED notice. See the list of differences for help on converting to PCRE. Tip spliti(3) is deprecated as of PHP 5.3.0. preg_split(3) with the i ( PCRE_CASELESS) modifier is the suggested alternative. SEE ALSO
preg_split(3), split(3), explode(3), implode(3). PHP Documentation Group SPLITI(3)
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