[Solved] Check If String Exists in Text Field

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You could use HTML5 form validation. Simply make the field required and give it a pattern. No JS required (although you might choose a polyfill for old browsers).

Try and submit this form without matching the pattern:

<form>
    <input name="myInput" 
           required="required" 
           placeholder="Must contain Mickey" 
           pattern=".*Mickey.*" 
           title="It must contain Mickey somewhere."
    />
    <input type="submit" />
</form>

Also: Untested example with basic JS fallback

solved Check If String Exists in Text Field