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# ->clean()
 -  returns the string unmodified
 -  converts the value to a string
 -  converts the value to a string
 -  checks the maximum length allowed
 -  option set the maximum length of the string
 -  throws a sfValidatorError
 -  error message customization
 -  checks the minimum length allowed
 -  option set the minimum length of the string
 -  throws a sfValidatorError
 -  error message customization
# UTF-8 support
 -  supports UTF-8
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