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Thanks very much for your comments and suggestions RudiC and Don.

I will try the posted code on my data to see if it produces the output I wanted to achieve and get back to you...

Sorry typo...should have said 0x7F (corrected it now)

So all values greater than this, starting with 0x80 will be represented as 4 digits and the length set to 02, i.e. 84020080a7

It's the same question but worded differently, appreciated it's still not clear though.

Ok, new example, original file:
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Sorry first poster trying to explain... :)

So I have a file containing one long line of hex (converted from BER ASN.1), i.e.

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I have a long string of hex (from ASN.1 data) where I need to find and change a particular hex value only and increment it. The hex pairs either side (84 and a7) of the value to increment will remain...