The problem here is the conflict between numbers and alphanumeric in the problem description.
Given the text:
＜0＞＜1＞＜2＞＜3＞＜4＞＜5＞＜6＞＜7＞＜8＞＜9＞＜10＞＜11＞＜12＞＜13＞＜14＞＜15＞＜16＞＜17＞＜18＞The next 11 keys can change the SWING from OFF (50%) to ＜19＞＜20＞＜21＞＜22＞＜23＞＜24＞＜25＞80＜26＞＜27＞＜28＞＜29＞＜30＞＜31＞＜32＞% during arpeggiator or sequencer operation.＜33＞＜34＞
I need to extract the following four groups:
＜0＞＜1＞＜2＞＜3＞＜4＞＜5＞＜6＞＜7＞＜8＞＜9＞＜10＞＜11＞＜12＞＜13＞＜14＞＜15＞＜16＞＜17＞＜18＞ ＜19＞＜20＞＜21＞＜22＞＜23＞＜24＞＜25＞ ＜26＞＜27＞＜28＞＜29＞＜30＞＜31＞＜32＞ ＜33＞＜34＞
Reason: we want to display this in a much more user-friendly way as…
[1]The next 11 keys can change the SWING from OFF (50%) to [2]80[3]% during arpeggiator or sequencer operation.[4]
Current code:
$pattern = '＜[d＜＞' . REGSTART . REGEND . REGSTARTSQ . REGENDSQ . '{}]+＞';
$numberofsupertags = preg_match_all('/(' . $pattern . ')/', $source, $superchunks);
echo '<pre>';
print_r($superchunks);
echo '</pre><br>';
(REGSTART/REGEND/REGSTARTSQ/REGENDSQ refer to other possible pairs of symbols, like 【】 or 〖〗 etc.)
gives three groups:
＜0＞＜1＞＜2＞＜3＞＜4＞＜5＞＜6＞＜7＞＜8＞＜9＞＜10＞＜11＞＜12＞＜13＞＜14＞＜15＞＜16＞＜17＞＜18＞ ＜19＞＜20＞＜21＞＜22＞＜23＞＜24＞＜25＞80＜26＞＜27＞＜28＞＜29＞＜30＞＜31＞＜32＞ ＜33＞＜34＞
As you can see, the RegEx fails to take into account sequences of only numbers between tags.
I’ve tried lots of things:
$pattern = '([＜|' . REGSTART . REGSTARTSQ . '|{]d+?[＞|' . REGEND . REGENDSQ . | }])+';
$pattern = '＜[d＜＞' . REGSTART . REGEND . REGSTARTSQ . REGENDSQ . '{}]+[＞(?=d)|＞]';
…but to no avail.
What is the correct solution and where do I go wrong? This looks really simple, but apparently it isn’t.
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Answer
You can use
(?:＜(?:{d+}|【d+】|〖d+〗|d+)＞)+
See the regex demo. Details:
(?:– start of a non-capturing group:＜– a＜char(?:{d+}|【d+】|〖d+〗|d+)– one of the alternatives:{+ one or more digits +},【+ one or more digits +】,〖+ one or more digits +〗or one or more digits＞– a＞char
)+– one or more times.
See the PHP demo:
$source = '＜0＞＜1＞＜2＞＜3＞＜4＞＜5＞＜6＞＜7＞＜8＞＜9＞＜10＞＜11＞＜12＞＜13＞＜14＞＜15＞＜16＞＜17＞＜18＞The next 11 keys can change the SWING from OFF (50%) to ＜19＞＜20＞＜21＞＜22＞＜23＞＜24＞＜25＞80＜26＞＜27＞＜28＞＜29＞＜30＞＜31＞＜32＞% during arpeggiator or sequencer operation.＜33＞＜34＞';
$cnt = 0;
echo preg_replace_callback('~(?:＜(?:{d+}|【d+】|〖d+〗|d+)＞)+~u', function($m) use (&$cnt) {
return '['. ++$cnt .']';
}, $source);
// => [1]The next 11 keys can change the SWING from OFF (50%) to [2]80[3]% during arpeggiator or sequencer operation.[4]