CAD tip # 13878:

Download the SelectSimilar .LSP file from Download and load it into your AutoCAD, LT or Web app with the _APPLOAD command. Start it by typing the SELS command.

Select the source object (or objects) and use the Settings option dialog or the command line options/toggles (when CMDDIA=0, or by invoking the commandline version -SELS, or when in AutoCAD Web) to pick the properties to match "similarity". E.g. the object type, layer, color, style (e.g. text style or dim style), name (e.g. blocks), linetype, linetype scale, lineweight, plot style. Unlike the standard SelectSimilar, you can also disable the object-type similarity. You can also use a negative match - i.e. all objects but CIRCLEs, all but the Red ones, etc.

The options are stored and restored from the standard SELECTSIMILARMODE system variable (if available).

The object Names can be used also for modified dynamic blocks (except in the AutoCAD Web app).

The resulting selection set (containing the source and all the similar objects) is grip-selected for further operations. The number of added objects is reported.

You can use the LISP command:

(setq _SelectSimDebug T)