system/View/Parser.php
protected function parseSingle(string $key, string $val): array
	{
		$pattern = '#' . $this->leftDelimiter . '!?\s*' . preg_quote($key) . '\s*\|*\s*([|a-zA-Z0-9<>=\(\),:_\-\s\+]+)*\s*!?' . $this->rightDelimiter . '#ms';

		return [$pattern => $val];
	}
protected function parseSingle(string $key, string $val): array
	{
		$pattern = '#' . $this->leftDelimiter . '!?\s*' . preg_quote($key) . '\s*\|*\s*([|a-zA-Z0-9<>=\(\),:_\-\s\+]+)*\s*!?' . $this->rightDelimiter . '#ms';

		return [$pattern => $val];
	}
Parse a single key/value, extracting it

@param  string $key
@param  string $val
@return array