| # simple expansion -- no problem, it's quote_string_for_globbing that was flawed |
| c=$'\177' |
| r="\\$c" |
| |
| recho $r |
| |
| # first, match some regular expressions containing ^A, ^G, ^? |
| [[ $'\001' =~ $'\001' ]] ; echo $? |
| [[ $'\001' =~ $'\\\001' ]] ; echo $? |
| [[ $'\001' =~ $'\\[\001]' ]] ; echo $? |
| |
| [[ $'\a' =~ $'\a' ]] ; echo $? |
| [[ $'\a' =~ $'\\\a' ]] ; echo $? |
| [[ $'\a' =~ $'\\[\a]' ]] ; echo $? |
| |
| [[ $'\177' =~ $'\177' ]] ; echo $? |
| [[ $'\177' =~ $'\\\177' ]] ; echo $? |
| [[ $'\177' =~ $'\\[\177]' ]] ; echo $? |
| |
| # Now let's try it with variables expanding to those values |
| for c in $'\001' $'\a' $'\177' ; do |
| for r in "$c" "\\$c" "\\[$c]"; do |
| [[ $c =~ $r ]]; |
| printf '[[ %q =~ %q ]] -> %d\n' "$c" "$r" "$?"; |
| done; |
| printf %s\\n --- |
| done |
| |
| # try again with literals |
| |
| [[ '' =~ $'' ]] ; echo $? |
| [[ '' =~ '\' ]] ; echo $? |
| [[ '' =~ '\[]' ]] ; echo $? |
| |
| [[ '' =~ '' ]] ; echo $? |
| [[ '' =~ '\' ]] ; echo $? |
| [[ '' =~ '\[]' ]] ; echo $? |
| |
| [[ '' =~ $'' ]] ; echo $? |
| [[ '' =~ '\' ]] ; echo $? |
| [[ '' =~ '\[]' ]] ; echo $? |
| |
| # more expansions, but with literal non-special characters |
| [[ x =~ \x ]] ; echo $? |
| [[ x =~ \\x ]] ; echo $? |
| |
| bs='\' |
| [[ x =~ ${bs}x ]] ; echo $? |
| |
| [[ x =~ $'\\'x ]] ; echo $? |
| [[ x =~ '\'x ]] ; echo $? |
| |
| v='a\-b' |
| [[ a-b =~ ${v} ]] ; echo $? |
| [[ a-b =~ a\-b ]]; echo $? |
| [[ a-b =~ a${bs}-b ]]; echo $? |
| [[ a-b =~ a\\-b ]] ; echo $? |
| [[ a-b =~ "a\-b" ]] ; echo $? |
| |
| c=$'\001' |
| |
| recho $c "$c" |
| |
| [[ $c == $c ]] && echo ok 1 |
| [[ $c =~ $c ]] && echo ok 2 |
| [[ $c =~ \\$c ]] || echo ok 3 |
| [[ $c =~ \\"$c" ]] || echo ok 4 |
| |
| [[ $c =~ "\\"$c ]] || echo ok 5 |
| [[ $c =~ '\'$c ]] || echo ok 6 |
| |
| [[ $c =~ "\\""$c" ]] || echo ok 7 |
| [[ $c =~ '\'"$c" ]] || echo ok 8 |