<div>
([12][0-9]{3})(0[1-9]|1[0-<wbr />2])<br />
<br />
which allows the year to start with 1 or 2 followed by 3 digits, then the month syould be 01 upto 09 or 10 through 12
</div>


([12][0-9]{3})(0[1-9]|1[0-2])

which allows the year to start with 1 or 2 followed by 3 digits, then the month syould be 01 upto 09 or 10 through 12

<div>
<div class="content wysiwyg-content">
[0-9]{6}<br />
<br />
YYYYMM<br />
200400<br />
The expression above excepts &nbsp;200400<br />
We must not let it accept it.
</div>
</div>


[0-9]{6}

YYYYMM
200400
The expression above excepts  200400
We must not let it accept it.

Regular expression.

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