如何用正则表达式定位后跟.send_keys的b.element？

Got it, I see exactly what you're aiming for—you want to isolate just the b.element portion whenever it's followed by a .send_keys call, instead of matching the full b.element(...).send_keys string.

The trick here is using a positive lookahead assertion in your regex. This lets you verify that a specific pattern comes right after your target text, without including that trailing pattern in your final match result.

The Regex You Need #

b\.element(?=\(.*\)\.send_keys)

Let’s break this down step by step:

• b\.element: Matches the literal string b.element (we escape the dot with \ because dots act as wildcards in regex by default).
• (?=\(.*\)\.send_keys): This is the positive lookahead. It checks that immediately after b.element, there’s:
  • An opening parenthesis \(
  • Any sequence of characters (the arguments inside your element call) .*
  • A closing parenthesis \)
  • Followed directly by .send_keys

Example Usage #

If your input string is:

b.element(By.ID, "username_input").send_keys("my_username")

Running the regex above will match only b.element, not the rest of the line.

Bonus: Capture the Full Element Call (Without .send_keys) #

If you ever need to grab the entire b.element(...) part (excluding .send_keys), you can tweak the regex to:

b\.element\(.*\)(?=\.send_keys)

This would match b.element(By.ID, "username_input") in the example above.

内容的提问来源于stack exchange，提问作者RAJ