re.place — regexp search and replace WordPress plugin
I wrote a small plugin for WordPress, which can search for specified strings (as regular expressions) in posts and pages and replace them with something else.
Just take a look:
Typed as PARDON, you see as:

Typed as YouTube(TMCf7SNUb-Q), you see as:
Under debugging 
You can download re.place plugin here.
And here is an official re.place plugin page .
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