bash - Sed cannot convert uppercase to lowercase -

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I want to change the "email address" variance in lowercase in a JSON message. I tried to use sed but failed, because \ l option does not work for me, am I missing something? 

  a = "{" id ": null," enabled ": true," password ":" "," email ":" foo@bar.com "," last name ": "Foo", "First Name": "Eligible"} "Allo $ a | Sed -e / s Email: [[Graph:]]. *, The last / \ L & g / '

returns the result: 

  {id: blank, enabled: true, password :, {l} Email: Foo @ Bar Com, last name: foo, firstname: lol}

I want the result: 

  {ID: blank, enabled: true, password :, email: foo @ Bar.com, lastName: foo, first name: lol}

I think That you do not have GNU sed and therefore do not have access to \ l . Instead, try Perl: 

  "$ a" echo Perl -pe 's / (email: [[graph:]] *, last) / \ L \ 1' '

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