Hello how can I add a filter to my themes functions.php to replace some strings

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Hello how can I add a filter to my themes functions.php to replace some strings in the oputput of the plugin ?

For example:

to replace texts in the post content, I use a filter for “the_content”

wich one tag need I do for the plugin ?

I need a dynamic post processing in my functions .php of the url and icons in the buttons of the sticky