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1 liveuser 1 
<?php
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function isColor($color) {
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	//return preg_match('/(#[\dA-Fa-f]{6}|[A-Za-z]+|rgb\(\d{1,3},\d{1,3},\d{1,3}\))/', $color);
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	return preg_match('/#[\dA-Fa-f]{6}/', $color);
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}
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function isNumeric($value, $nonNegative = false) {
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	if ($nonNegative) {
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		$pattern = '/\d+(.\d)*/';
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	} else {
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		$pattern = '/-?\d+(.\d)*/';
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	}
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	return preg_match($pattern, $value);
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}
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function isLengthValue($value, $nonNegative = false) {
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	if ($nonNegative) {
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		$pattern = '/\d*.?\d+(pt|cm|mm)/';
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	} else {
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		$pattern = '/-?\d*.?\d+(pt|cm|mm)/';
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	}
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	return preg_match($pattern, $value);
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}
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function isPercentage($value) {
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	return preg_match('/\d+(.\d)*%/', $value);
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}
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?>