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This is just a quick script to demonstrate using a function to calculate the replacement string. I'm posting it here, just so I can refer to it in the N++ open discussion / help forums when someone asks how to do a replacement that needs computation.
# Demo to use the results of a function as the replacement text.
# We'll search for 'N' followed by a number, and return a string with
# 'D' followed by the number doubled.
# So, The text "This is N32 which references N15"
# Will become "This is D64 which references D30"
# The replacement function gets a Regex Match object as a parameter
# and returns the complete replacement string.
# Therefore, in this example, m.group(1) is the first matching group
# (in this case the number), and m.group(0) is always the entire found string
# (so in this case N[number])
return 'D' + str(int(m.group(1)) * 2)