Apache mod rewrite examples

Scenario 1: To extract the specific word from QUERY_STRING in a URL.

 RewriteCond %{QUERY_STRING} ^(.*)matching-word=([^&]+)&?(.*)$
RewriteRule ^(.*)request-url$  https://%{HTTP_HOST}/some/path/value=%2 [NE,QSA,PT,L]
In the above scenario, we would like to extract the value after <matching-word> string and before the & or ? charecters in the QUERY_STRING.
Example: 

 Source url:  https://mydomain.com/request/url/test1?myquery&string=value1&test123

 Destination url:  https://mydomain.com/some/path/value=value1

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