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- # same result
- bash-4.2$ [[ 'test' == ?e* ]]; echo $?
- 0
- bash-4.2$ [[ 'test' == ?x* ]]; echo $?
- 1
- bash-4.2$ [[ 'test' =~ .e.* ]]; echo $?
- 0
- bash-4.2$ [[ 'test' =~ .x.* ]]; echo $?
- 1
- # but at different speed
- bash-4.2$ time for x in {1..1000000}; do [[ 'test' == ?e* ]]; done
- real 0m4.943s
- user 0m4.899s
- sys 0m0.011s
- bash-4.2$ time for x in {1..1000000}; do [[ 'test' =~ .e.* ]]; done
- real 0m17.056s
- user 0m16.962s
- sys 0m0.010s
- # measure the loop's own speed to subtract it
- bash-4.2$ time for x in {1..1000000}; do :; done
- real 0m4.357s
- user 0m4.329s
- sys 0m0.009s
- # to find out the times actually spent for matching
- # - [[ 'test' == ?e* ]] 4.943 - 4.357 = 0.586
- # - [[ 'test' =~ .e.* ]] 17.056 - 4.357 = 12.699
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