javascript - Pattern which take input in just positive integer -


i want take input in positive integer @ front end. make pattern takes input negative integers don't want negative integer in input. kindly me. 

echo "<input type=number pattern=[0-9] value='" . $counter_row['counter_balance'] . "' name=new_cash class=input_panel>";

that markup looks pretty invalid. need double quotes around properties values , regular expression pattern half finished, unclosed. looking for, more or less: 

echo '<input type="number"               pattern="[0-9]+"              value="' . $counter_row['counter_balance'] . '"               name="new_cash"               class="input_panel">'."\n";

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