change part of url

[jansky]

hi to all

im not familiar with regex and im still on process of understanding

so i need a little mouth spooling

how do i change part of url ( the number value 234to 127)

eg: http:/url/name/project_234.html?name=owner
or
http:/url/name/project_234.html

into http:/url/name/project_127.html?name=owner
or http:/url/name/project_127.html

thankx for understanding and solution

[dagon]

is it always the same number ?