Problem with regex in php

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Hello, in my code I want to separate a string, having as separator a value that should be found via regular expression. Down with what I tried:

    $data = "Amazing.Stories.2020.S01E03.REPACK.720p.WEB.H264-GHOSTS.mkv";

    $pattern = "[#^S\d\dE\d\d$#i]";
    $d = preg_split($pattern, $data);

    echo "<pre>";
    print_r($d);
    echo "</pre>";

In case the separator should be "S01E03", but is not able to find. the result that is giving is :

Array
(
    [0] => Amazing.Stories.2020.S01E03.REPACK.720p.WEB.H264-GHOSTS.mkv
)

The desired result would be:

Array
(
   [0] => Amazing.Stories.2020
   [1] => REPACK.720p.WEB.H264-GHOSTS.mkv
)

I confess that I am bad with regular expressions, but this same Pattern finds when I use it in a preg_grep for example.

Where am I going wrong?

php regex

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  • thanks again @hkotsubo. Your reply was of great value.

1 answer

1


Change the regex to:

$pattern = '#\.S\d{2}E\d{2}\.#i';

The markers ^ and $ indicate respectively the beginning and end of the string, so it makes no sense to use this in a split, since the pattern will be in the middle of the text. Remove them.

I also removed the clasps, which in this case were being used as delimiters of the expression - i.e., the # was also part of the regex. Thus leaving the # becomes the delimiter.

I also changed the two digits to \d{2} (can still use \d\d), and included the points before and after the text, because I understood that they are not part of the result. Remembering that the point has special meaning in regex (means "any character, except line breaks"), then for it to be interpreted only as the character ., I need to escape it with \.

To flag i indicates that the regex is case insensitive, that is, you will also consider the letters "s" and "e" lowercase. If you only want to consider capital letters, remove the i at the end of the expression.

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