Search and replace text in all files of a linux directory

I have a website directory where I need to change all hardcoded links from one d开发者_如何转开发omain to another. Looking for a single (grep? sed?) bash command that will allow me to change all occurrences of text in all files in the directory?

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The following will do it:

sed -i 's/old_link/new_link/g' file...

Don't forget to escape any slashes, dots, and any other regex special chars in the link addresses with a backslash.

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Also, try:

perl -p -i -e <regex> <folder>