[Mods - if the following isn't in the FAQ or how-to's, maybe it should be?]
How to remove numbers in front of titles or filenames:
Select the tracks to be changed (use Edit to "select all" or CTL-A to choose all tracks). Click on Action, seen at the top row . Choose Actions (Quick) from the dropdown actions list. In the new Action Type window, select "replace with regular expression" and click OK.
In the new Replace with regular expression window's Field box enter TITLE (all caps!). In the regular expression box there are three possibilities:
(1) If the track numbers go 01, 02, 03 with no spaces before the numbers, type this expression exactly as it's given - cut &paste is OK:
(Meaning: Look from the front of the title for any quantity, including quantity zero, of numbers 0 through 9, and any quantity of spaces after the numbers)
(2) If there are spaces in front of the numbers, like this, 8, 9, 10, type or cut&paste:
(Meaning: Look from the front of the title for any quantity of spaces, any quantity of numbers 0 through 9, and any quantity of spaces after the numbers)
(3) If there are dashes ( - ) after the numbers, type:
(Meaning: Look from the front of the title for any quantity of spaces, any quantity of numbers 0 through 9, and any quantity of spaces after the numbers, a - after the spaces, and any quantity of spaces after the dash)
Leave "Replace matches with" empty. Anything typed in here will be added in front of each title.
Do not click the "case-sensitive comparison" box. Numbers don't have upper or lower case, anyway.
Be sure the expression is right, the replace field is empty, the check box is empty, and click OK. If you like the results, save them. If you don't like the results, don't save them. It's that easy.
TITLE can be replaced with _FILENAME to remove numbers, spaces, and dashes in front of filenames. Everything else works as it did for cleaning up titles.
After any these expressions are typed in, they'll be listed in the pull-down with the list of regular expressions. Pull down the list, chose the one you want, and there it is. No typing needed when working on a new set of tracks. The only challenge is remembering the expressions are there, and which one is the right one. Write yourself a note, or do enough work with Mp3tag to remember which expression does what.
Thus endeth the lesson.
Trying to remove track numbers from titles has been posted to before, but most of the replies follow the form "RTFM but I'll give you a break and a how-to regular expression sample this time. How to use it is your challenge". Rather hostile IMNSHO.