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Magento zip code limit validation



By Default Magento give number of validation classes.you just need to use the class name.Its easy find the html tag where their is mobile number html and add a class attribute to that input type and under the class add the following classes "validate-length maximum-length-10 minimum-length-10 validate-digits"
validate-length maximum-length-10 minimum-length-10 validate-digits

 Reference: http://inchoo.net/magento/out-of-the-box-form-validation-in-magento/

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