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To dynamically replace the value of a GET parameter using Twig, you can use the app.request.query.get method along with the url_query_append filter.
For example, let's say you have a GET parameter named page and you want to replace its value with the Twig variable newPage. You can use the following code:
{% set newPage = 2 %}
<a href="{{ app.request.uri ~ '?' ~ app.request.query|merge({'page': newPage})|url_query_append }}">Next Page</a>
In this code, we first set the newPage variable to 2 (which could be any dynamic value). Then, we use the app.request.uri variable to get the current URL and append a question mark ? to it.
Next, we use the app.request.query variable to get an array of all GET parameters in the current URL. We merge this array with a new array that has the page parameter set to the value of newPage.
Finally, we use the url_query_append filter on this new array to generate a properly-formatted GET parameter string and append it to the current URL.
This will generate a link that goes to the current page with the page parameter set to the value of newPage.