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How to find out if a urlSegment is inside a PageArray


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i have a event-page with a table.
first column in this table is page-reference-field

how can i find out if a urlSegment matches one of the rows having the same page-reference-field (page-id)?

// all guests
$allguests = new pageArray();
foreach($page->event_guests_table as $event_guests_table_row) {

// echo allguests would output: 1101|1102|1103|…
// domain.tld/event/1101/

// show content if guest is in the table or redirect
if($input->urlSegment1 ~= $allguests ) {
	// show content
else {
	// redirect


which selector operator do i have to use? the one above does not work

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