File renaming pattern question

[tomuser]

Today is a questions day for me

Anyway, I have bunch files named like this (currently, this may change in future):

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20180911_154208_12.png

It is date and time and also some random number at the end. First 16 digits are same always, end may change only (number after time). I'd like to rename them so they'll look like this:

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2018-09-11_15-42-08_12.png

Tried to experiment all kind of known things like *$\<> in tons of options which I could think of but whatever I tried so far I got Invalid name error. (I haven't dealt also pretty long with these so I may be missing something very simple or obvious).

What wildcards and how should they be used in Batch Rename to end up like this? Or should I use some other option in XYplorer?

[highend]

RegExp Rename!

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(\d{4})(\d{2})(\d{2})_(\d{2})(\d{2})(\d{2})_(.*) > $1-$2-$3_$4-$5-$6_$7

[tomuser]

RegExp Rename!

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(\d{4})(\d{2})(\d{2})_(\d{2})(\d{2})(\d{2})_(.*) > $1-$2-$3_$4-$5-$6_$7

Aha, that was the catch. From here I can modify it further if needed. Thanks!