Check if filename characters match outside of whitelist

Question

In bash I'd like to test a number of directories if they contain filenames outside of what I have whitelisted:

[a-z]
[A-Z]
[0-9]
[+-_ßäöüÄÖÜ.,]
[ ]

(ie. one space is ok, two or more in a row would not).
Trying

$ ls my/dir/ |grep --color=always -v [a][b][c][d][e][f][g][h][i][j][k][l][m][n][o][p][q][r][s][t][u][v][w][x][y][z][A][B][C][D][E][F][G][H][I][J][K][L][M][N][O][P][Q][R][S][T][U][V][W][X][Y][Z][0][1][2][3][4][5][6][7][8][9]

yields all files, even the one containing a # character for testing.
So does the "shorthand" of

$ ls my/dir/ |grep --color=always -v [a-zA-Z0-9]

(and yes, I know I'd have to include the [+-_ßäöüÄÖÜ., ] characters into this later).

I have tried using diff for this:

$ diff -y <(ls -1 my/dir/) <(ls -1 /my/dir/|tr -cd '[a-zA-Z0-9\n\r \-\.\,]')|grep --color=never '|'|cut -d "|" -f 1

which outputs the filenames which are outside of my tr list:

A File Containing Some Rainbo#ws.wav

But this seems rather clumsy... Any ideas for something, well, nicer?

Answer 1

$ find -name '*[^a-zA-Z0-9+\-_ßäöüÄÖÜ., ]*' -o -name '*  *'

See man find. The -regex and -maxdepth options might also be interesting to you.

PS: Don't parse the output of ls.

Answer 2

Something to get you started:

#!/bin/bash

regex='^[a-zA-Z0-9.]+$'
while read line
do
    if ! [[ $(basename "$line") =~ $regex ]]
    then
        echo $line
    fi
done < <(find . -type f)

Answer 3

$ ls my/dir/ |grep --color=always -v [a][b][c][d][e][f][g][h][i][j][k][l][m][n][o][p][q][r][s][t][u][v][w][x][y][z][A][B][C][D][E][F][G][H][I][J][K][L][M][N][O][P][Q][R][S][T][U][V][W][X][Y][Z][0][1][2][3][4][5][6][7][8][9]

The above line will look for file names that don't contain the character sequence abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789, which is why it matches so many files.

try

$ ls my/dir/ |grep --color=always -v [^a-zA-Z0-9+-_ßäöüÄÖÜ. ]
$ ls my/dir/ |grep --color=always "  "

The first line looks for files that contain other characters than the white-listed ones. The second line looks for files that contain double space.