replace function problem

hi,
i wanna replace ‘[5]’ with ‘[6]’ (numbers are not important) i use

htmlCode=<input type=”text” name=”bbDetail[5].msisdn” id=”bbDetail[5].msisdn” class=”numericData” disabled=”true” size=”20″ value=”5322100191″ >
regex=/[5]/g;
var newHtml=htmlCode.replace(regex,'[6]’);

but result is
newHtml=htmlCode=<input type=”text” name=”bbDetail[[6]].msisdn” id=”bbDetail[[6]].msisdn” class=”numericData” disabled=”true” size=”20″ value=”[6]322100191″ >

if i use like that
var newHtml=htmlCode.replace(regex,'[6]’);
htmlCode=<input type=”text” name=”bbDetail[6].msisdn” id=”bbDetail[6].msisdn” class=”numericData” disabled=”true” size=”20″ value=”6322100191″ >

it changes ‘5’ to ‘6’ not only ‘[5]’

but i want

htmlCode=<input type=”text” name=”bbDetail[6].msisdn” id=”bbDetail[6].msisdn” class=”numericData” disabled=”true” size=”20″ value=”5322100191″ >

where am i wrong?

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