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If you want to run a regular expression search which will find all characters except a few that you designate, you should use this format:
[^0123]
. . . this Regex will return all characters except those listed after the caret in the brackets.
It’s well known that putting a caret in front of a regular expression search will limit results to strings found at the beginning of each line.
... and adding a dollar sign at the end will restrict the results to searched for strings at the end of each line.
If you want the regex search to find results from the beginning or end of every line start with (?m):
If you only want to find lines in a text file which contain text and no numbers, you can use this regular expression search in NotePad++:
^[a-zA-Z]+$
. . . you can easily mark the lines which don't have digits.