How Can I Efficiently Find Strings Containing a Substring in a Python List?

Identifying Substrings in a List of Strings

When faced with a list of strings, you may encounter the need to search for items that share a specific substring. To achieve this, you can employ Python's built-in functions for efficient string matching.

In the given scenario, where we have a list of strings (xs) and a target substring ('abc'), a simple check for the substring's presence in the list may not suffice. To accurately detect all occurrences, including partial matches like 'abc-123', we need a more refined approach.

To determine if any string in the list contains the substring, the any() function can be employed:

if any("abc" in s for s in xs):
    ...

This expression returns True if at least one string in xs contains the substring 'abc'. The for loop iterates through each string in xs, checking for the substring's presence using the in operator.

Furthermore, to retrieve a list of all strings that match the substring criterion, a list comprehension can be used:

matching = [s for s in xs if "abc" in s]

This expression creates a new list, matching, that contains only the strings from xs that contain the substring 'abc'.

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