identify ISSN numbers in an mrc file

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Hello community,

how would you treat the following?

I need a way to identify all tags - subfields, that have stored an ISSN
number in them.

What would you suggest as a clever approach for this?

Thank you

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<div dir=3D"ltr">Hello community,<div><br></div><div>how would you treat th=
e following?</div><div><br></div><div>I need a way to identify all tags - s=
ubfields, that have stored an ISSN number in them.=C2=A0</div><div><br></di=
v><div>What would you suggest as a clever approach for this?</div><div><br>=
</div><div>Thank you</div></div>

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