iview input box input content validation

ruleValidate: {

pwd: [{
                  required: true,//Can't be empty
                  message: 'Password can't be empty',//Show information
                  trigger: 'blur'//Trigger event
                },
                {
                  type: 'string',
                  pattern: / ^[a-zA-Z]+[a-z0-9A-Z\W]{5,49}.*$/,//Regular expression verification
                  message: 'You must enter 6-50 characters starting with a letter string! ',
                  trigger: 'blur'
                }
              ],

}