Class Alpha
Check if the input contains only letters (a-z)
- Wei\Base
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			 Wei\Validator\BaseValidator Wei\Validator\BaseValidator
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			 Wei\Validator\Regex Wei\Validator\Regex
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			 Wei\Validator\Alpha Wei\Validator\Alpha
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			__invoke(), 
			doValidate()
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			__call(), 
			__construct(), 
			__get(), 
			getOption(), 
			setOption()
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			t()
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			protected  
			string
		 | $patternMessage | 
				#
				 '%name% must contain only letters (a-z)' | 
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			protected  
			string
		 | $pattern The regex pattern | 
				#
				 '/^([a-z]+)$/i' | 
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			$negativeMessage
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			$errors, 
			$name, 
			$negative, 
			$notStringMessage, 
			$validator
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			$providers, 
			$wei
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			$t
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