| # regex should accept '+' operator | |
| [[ abcdef =~ a[b-z]+ ]]; echo 1:YES:$? | |
| # newline matches by "match any" patterns | |
| v=' | |
| ' | |
| [[ "$v" =~ . ]]; echo 2:YES:$? | |
| [[ "$v" =~ "[$v]" ]]; echo 3:no:$? # hmm bash does return 1... why? | |
| [[ "$v" =~ [^a] ]]; echo 4:YES:$? | |
| # should work even without quotes: | |
| [[ $v =~ . ]]; echo 2u:YES:$? | |
| [[ $v =~ [$v] ]]; echo 3u:YES:$? | |
| [[ $v =~ [^a] ]]; echo 4u:YES:$? |