xslt 1.0 - Formatting string (Removing characters 'BX' from string)

Hi guys,

Can you please assist with function below.

I need to handle two scenarios.
To remove characters 'BX' and replace with two preceding zero’s if zero after 'BX' exist.
example:
BX0000000005100368  - mapped to - 000000000005100368

And if zeroes not exist, remove 'BX' only.
example:
BXG1563300110901 - mapped to - G1563300110901

<xsl:value-of select="concat('00', substring-after($string, 'BX'))"/>

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thank you,
Darius