Description:
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The preg_replace is doing a double replacement when the parenthesized pattern is the whole string.

Test script:
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define ('EOL', "\n");

$patterns = '|(.*)|';
$replacements = '$1-new';
$line = 'OLD';

$line = @preg_replace($patterns, $replacements, $line, -1, $changes);
print $line . EOL;

Expected result:
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'OLD-new'



Actual result:
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'OLD-new-new'