title: regex pattern for numeric values in aws s3 bucket policy
body: <p>how to build regex pattern in aws s3 bucket policy to allow only specific files with names and extensions copied to s3 bucket.
  ex: DGCSCons_<strong>6193_20150422</strong>.dat_AEL.dat.bz2<br>
  in the above file name i want to build regex for numeric characters along with specifying _. how to do this?</p>