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  1. #!/bin/bash
  2.  
  3. doContain() {
  4.     reqsubstr="$1"
  5.     shift
  6.     string="$@"
  7.     if [ -z "${string##*$reqsubstr*}" ] ;then
  8.         # echo "String '$string' contain substring: '$reqsubstr'.";
  9.         true
  10.       else
  11.         # echo "String '$string' don't contain substring: '$reqsubstr'."
  12. 	false
  13.     fi
  14. }
  15.  
  16. export -f doContain
  17.  
  18. nst='a=two;b=onetwothree; x=100000; while [ $x -gt 0 ]; do TEST ; x=$(($x-1)); done'
  19. nst='a=nonesvch;
  20. b=nosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatchnosuchmatch;
  21. for((x=0; x<10000; ++x)); do TEST && { echo FAIL; exit 127; }; done'
  22. :<<\=cut
  23. for TEST in '[[ $b =~ $a ]]' '[ "${b/$a//}" = "$b" ]' '[[ $b == *$a* ]]' \
  24.         'case $b in *$a*):;;esac' 'doContain "$a" "$b"'; do
  25.     printf '%s ' "$TEST"
  26.     /usr/bin/time bash -c "${nst/TEST/$TEST}"
  27. done
  28. =cut
  29. for TEST in '[[ $b =~ $a ]]' '! [ "${b/$a//}" = "$b" ]' '[[ $b == *$a* ]]' \
  30.         'case $b in *$a*):;; *) false;; esac' 'doContain "$b" "$a"'; do
  31.     printf '%s ' "$TEST" >&2
  32.     time bash -c "${nst/TEST/$TEST}"
  33. done
  34.  
Runtime error #stdin #stdout #stderr 0.94s 4540KB
comments (?)
stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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[[ $b =~ $a ]] 
real	0m0.168s
user	0m0.164s
sys	0m0.000s
! [ "${b/$a//}" = "$b" ] 
real	0m0.233s
user	0m0.232s
sys	0m0.000s
[[ $b == *$a* ]] 
real	0m0.086s
user	0m0.084s
sys	0m0.000s
case $b in *$a*):;; *) false;; esac 
real	0m0.094s
user	0m0.092s
sys	0m0.000s
doContain "$b" "$a" 
real	0m0.369s
user	0m0.368s
sys	0m0.000s
https://ideone.com/5roEVt
https://stackoverflow.com/questions/229551/string-contains-in-bash
language:
Bash (bash 5.0.3)
created:
6 years ago
visibility:
public

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