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comment form custom validation

I am using a custom validation in my Drupal 7 comment form.
I want to match the comment_body against a word "example" so if someone just type "example"in the comment body then it will show a error message that only the word "example" is not allowed. After reading drupal api documentation i codded like this:

function mango_form_comment_node_news_form_alter(&$form, &$form_state, $form_id){     $form['comment_body']['#prefix'] = '<div class="sm">Post your comment now!</div>';     $form['actions']['submit']['#value'] = 'Post Your Comment';     $form['#validate'][] = 'banana'; }  function banana($form, &$form_state) {   if ($form_state['comment_body'] == "example") {     form_set_error('comment_body', 'Your comment can not contain example!');   } }

Do not working :'( what i’m missing? Thanks

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comment form custom validation

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