From documentation:

Method: find(pattern, start_point, <flags>)

Return Value: Region

Description: Returns the first region matching the regex pattern, starting from start_point, or Region(-1, -1) if it can’t be found. The optional flags parameter may be sublime.LITERAL, sublime.IGNORECASE, or the two ORed together.


~ Ex.:

import sublime, sublime_plugin
class AfterSavingEventListener(sublime_plugin.EventListener):
    def on_post_save(self, view):
        print(view.find("s", 0))