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How to alter user’s input?

I have a form to get some user input in Drupal. I want to add some prefix to the user input.

For example, the user enters “Laptop”; I want to save it in the database as resource_Laptop. I want to add the prefix before the validation is done, to avoid it fails.

How do I do this? Will hook_form_alter() help me here?

I have used this method, but not satisfied with this hack.

function mymodule_form_alter(){   drupal_add_js("     (function ($) {       $(document).ready(function() {                             $('.field-suffix').hide();           $('#edit-submit').click(function(){         var s = $('#edit-machine-name').val();          if (s.indexOf('_resources') == −1) {           $('#edit-machine-name').val($('#edit-machine-name').val() + '_resources');         }       });        })(jQuery);", 'inline'); }
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How to alter user’s input?

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