Regular expression help

[rs232]

I'm trying to use Ant Renamer to remove any character after the year in a folder name.
I'm a bit confused on what's Ant renamer is asking me to do.
I've tried

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(.+(?:(?:19|20)[0-9]{2})).(.*)

match everything until the 4 digit year and match everything else afterwards

with new name:

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S1

but I get the following error in the preview:

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<RegExp Error> TRegEpr(comp): Unrecognised Modifier (pos 14)

Any tip on how to fix please?
Thanks! :-)

[antp]

The regex parser that I use is probably somewhat limited

Wouldn't it work also with such basic solution?

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(.+)((19|20)[0-9]{2}).(.*)

new name:

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$1$2$4

[rs232]

That worked beautifully.

Thanks!