[Linux 常見問題] Bash - Using regex match string

Source From Here
Question
As title. How to use regex to compare string in Bash?

How-To
To match regexes you need to use the =~ operator. For example:
- testReg.sh

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1. #!/bin/bash  
2. IFS='\n' read -a array <<< `find ~/ -type f -name "*.sh"`  
3.   
4. for element in ${array[@]}  
5. do  
6.     [[ $element =~ test.* ]] && echo "$element (o)" || echo "$element (x)"  
7. done  

Execution sample:

# ./testReg.sh
/root/test.sh /root/testReg.sh /root/tmp/test/test.sh /root/abc.sh
/root/test.sh (o)
/root/testReg.sh (o)
/root/tmp/test/test.sh (o)
/root/abc.sh (x)

Alternatively, you can use wildcards (instead of regexes) with the == operator:

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1. #!/bin/bash  
2. IFS='\n' read -a array <<< `find ~/ -type f -name "*.sh"`  
3.   
4. for element in ${array[@]}  
5. do  
6.     [[ $element == *test* ]] && echo "$element (o)" || echo "$element (x)"  
7. done  

Execution result:

# ./testReg.sh
/root/test.sh (o)
/root/testReg.sh (o)
/root/tmp/test/test.sh (o)
/root/abc.sh (x)