Validation for adding atleat three skills in input box using jquery or javascript -


need add validation adding atleast 3 skills in textbox. having form applying job in there option entering primary skills user knows , separated comma.so need add validation if user enters 1 skill while submiting form should show message atleaset 3 skills required. using codeigniter php

<div class="primaryskillss">                      <input type="text" class="form-control primaryskills" name="primary_skills"  value="<?php echo set_value('primary_skills');?>" placeholder="primary skills(enter 3 skills separated comma)" required>                       <?php echo form_error('primary_skills', '<div class="error">', '</div>'); ?>                       </div>                       <button type="submit"  class="btn btn-success successss" id="submits">submit</button>    

if(substr_count($_post['primary_skills'],',')<2){     //error }

if forcing user sepperate skills commas, count number of commas there are? it's poor man's way should work...

to prevent users putting ",,", should try fetch using regex test commas separating @ least 1 character:

if(preg_match(/.+,.+,.+/,$_post['primary_skills'])){     //error }

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