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Re: How to use [[ string =~ regexp ]]?

From: Mike Stroyan
Subject: Re: How to use [[ string =~ regexp ]]?
Date: Sun, 21 May 2006 13:57:41 -0600

On 5/21/06, Peter Volkov <address@hidden> wrote:

I have problems using =~ operator. I've tried to search for answer, but
failed. I'm using GNU bash, version 3.1.17. Can anybody give me some
examples of usage?

I really do not understand why

$ [[ "string" =~ "[a-z]" ]] && echo something

echo me something. IIUC the regular expression [a-z] matches any single
letter, so how string "string" matches one letter?

The =~ regexp match will match a substring by default.  You can use ^ and $
to anchor the expression to the start and end of the string.  You
won't get a match
[[ "string" =~ "^[a-z]$" ]] && echo match
But you will get a match with
[[ "string" =~ "^[a-z]{6}$" ]] && echo match
because it matches the correct number of characters.

Mike Stroyan

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