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Take a look at the -A <em>acclist</em> / --accept <em>acclist</em>.

I've only used it download specific extensions, but from what I've read, you should be able to use wildcards to download specific patterns e.g -A *ArthurDent* to download all files with "ArthurDent" in the filename.

It depends upon what options you specify.

From the download options page under -nc

"When running Wget without ‘-N’, ‘-nc’, ‘-r’, or ‘-p’, downloading the same file in the same directory will result in the original copy of file being preserved and the second copy being named ‘file.1’. If that file is downloaded yet again, the third copy will be named ‘file.2’, and so on. (This is also the behavior with ‘-nd’, even if ‘-r’ or ‘-p’ are in effect.) When ‘-nc’ is specified, this behavior is suppressed, and Wget will refuse to download newer copies of ‘file’. Therefore, “no-clobber” is actually a misnomer in this mode—it’s not clobbering that’s prevented (as the numeric suffixes were already preventing clobbering), but rather the multiple version saving that’s prevented.

When running Wget with ‘-r’ or ‘-p’, but without ‘-N’, ‘-nd’, or ‘-nc’, re-downloading a file will result in the new copy simply overwriting the old. Adding ‘-nc’ will prevent this behavior, instead causing the original version to be preserved and any newer copies on the server to be ignored.

When running Wget with ‘-N’, with or without ‘-r’ or ‘-p’, the decision as to whether or not to download a newer copy of a file depends on the local and remote timestamp and size of the file (see Time-Stamping). ‘-nc’ may not be specified at the same time as ‘-N’. "