Easier to use file().
<?php
$data = file('paulq.txt', FILE_IGNORE_NEW_LINES|FILE_SKIP_EMPTY_LINES);
$start = "sales_probability_dom";
$results = [];
$pos = array_search($start, $data); // find start key
while ($data[++$pos][0]=="\t") { // check for tab at start of line
$results[] = trim($data[$pos]);
}
echo '<pre>', print_r($results, 1), '</pre>';
?>
giving
Array
(
[0] => @clear
[1] => \"\": \"\"
[2] => Closed Won: \"100\"
[3] => Id. Decision Makers: \"40\"
[4] => Needs Analysis: \"25\"
[5] => Negotiation\/Review: \"80\"
[6] => Perception Analasis: \"50\"
[7] => Proposal\/Price Quote: \"65\"
[8] => Prospecting: \"10\"
[9] => Qualification: \"20\"
[10] => Value Prospecting: \"30\"
)