| # expansions involving patterns | |
| var='[hello' | |
| echo "${var//[/}" | |
| red='\[\e[0;31m\]' | |
| echo "${red//\\[\\e/}" | |
| foo="${red//\\[\\e/}" | |
| # foo == [0;31m\] | |
| echo "${foo//[0;31m\\/}" | |
| echo "${var//[]/}" | |
| echo "${red//[]/}" | |
| v=hello | |
| foo='[:alpha:]' | |
| echo ${v//[[:alpha:]]/} | |
| echo ${v//[[:alpha]]/} | |
| echo ${v//[[:alpha]/} |