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Restrict Input feilds

 Code 1

<label for="salary">Enter your salary:</label>
<input type="text" id="salary" name="salary"
    oninput="this.value = this.value.replace(/[^0-9.]/g, '').replace(/(\..*)\./g, '$1');" />

 Code 2

<input onkeypress="return /[a-z]/i.test(event.key)" >

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