Notepad++ Regex Replace Capture Groups With Numbers -

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so have numbers i'm trying replace in notepad++ , have tweak both positive values , negative ones, search looks this:

v (.{0,1})13.500000

and replace:

v $1 10.500000

except don't want space there between capture group reference , other digits, if leave space out, places nothing (no capture group #110).

how "escape" capture group separate character-literals without inserting unwanted character?

i 2 replacements, figured must possible, although can't figure out how search it.

sample source text:

v 13.000000 19.0000000 8.000000 v 13.000000 19.0000000 9.000000 v -13.000000 19.0000000 9.000000 v -13.000000 19.0000000 8.000000

desired result:

v 10.000000 19.0000000 8.000000 v 10.000000 19.0000000 9.000000 v -10.000000 19.0000000 9.000000 v -10.000000 19.0000000 8.000000

try replacement:

v ${1}10.500000

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