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So I have a pattern like somepattern-abc-1.2.3-aji3mk3-11.tar. I need to add a condition where 

if [ $input matches somepattern[].tar ] then do something fi

here the somepattern will be a constant one, rest all till ".tar" will vary and can have a hyphen or a letter or a number. What can I replace my [] with so that it will be satisfied?

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    Can you please try to reword the following sentence, I am unable to make any sense of it: rest all till ".tar" will vary and can have a hyphen or a letter or a number. Commented Nov 14, 2019 at 16:40
  • Actually I think I may understand it but you will need to tell us exactly what somepattern is. Commented Nov 14, 2019 at 16:41
  • somepattern is something like "operator" Commented Nov 14, 2019 at 16:43
  • so in between operator and .tar we can have any pattern and this pattern will contain alphabet or number or - Commented Nov 14, 2019 at 16:44
  • And also a dot .? Commented Nov 14, 2019 at 16:44

2 Answers 2

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You can test with this:

input="somepattern-abc-1.2.3-aji3mk3-11.tar" [[ "$input" =~ ^somepattern[-.a-z0-9]*\.tar$ ]] && echo "match" # here your command
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If you can write the pattern as a regexp then you have the bash operator =~ that will compare the first argument with the regular expression on the other side.

You can test it with something like:

read a;[[ "$a" =~ "x" ]] && echo $a

where "x" is your pattern.

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  • Note that if you quote the right hand side of =~, it becomes literal. ".*", for example, would match a dot followed by an asterisk. Commented Nov 14, 2019 at 17:59

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