How to change links in a site collection in Sharepoint 2013

I have a site collection and have numerous links inside site collection that starts with main site URL, for example -

https://test.welfare.com/sites/Projects/Pages.aspx, https://test.welfare.com/sites/Projects/test.apsx etc..

I want to loop through whole site collection and find all navigation links and change it to,

https://Projects.testPM.com/sites/Projects/Pages.aspx, https://Projects.testPM.com/sites/Projects/test.apsx etc..

I just want to change the main URL and keep the rest as is.

Tanks
buzzme123Asked:
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IsaacSharePoint Client Side DeveloperCommented:
What coding method are you able to use? JavaScript, C#, CSOM, JSOM, etc?


Here's a good start depending on your method:
http://www.sharepointdiary.com/2012/06/iterate-through-webapps-sitecollections-sites-lists-listitems.html

Powershell will probably be your best option:
http://blogs.msdn.com/b/rcormier/archive/2012/09/27/how-to-fix-navigational-links-after-relocating-a-site-collection.aspx
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