c# - How can we assign length for the regex Code in WPF XAML Code -

c# - How can we assign length for the regex Code in WPF XAML Code -

how can input length in regex code following code. can insert more 15 digits if use regex mask

 <dxe:buttonedit x:name="txtedtmobile" width="auto"  maxlength="15" grid.column="2" grid.row="7" margin="2,2,2,2" validateontextinput="true"  tooltip="searchcountrycode" mask="[+ 0-9]+" masktype="regex" />

see below lines, may you. in place of 256 can add digits want add.

^(?!^.{256})([a-za-z0-9_-.]+)@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.)|(([a-za-z0-9-]+.)+))([a-za-z]{2,4}|[0-9]{1,3})(]?)

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