How Can I Efficiently Detect Substrings within a Python List of Strings?

Substring Detection within String Lists

In Python, determining whether a given string appears as a substring within elements of a list of strings requires careful consideration.

Identifying Substrings in String Lists

While the basic membership check evaluates whether a string exists in a list, it falls short when searching for substrings within string elements. To address this, a more granular approach is required.

Looping with any() for Substring Inclusion

The any() function allows us to iterate through the list and check if any string contains the desired substring. This approach captures substrings even when embedded within larger strings:

xs = ['abc-123', 'def-456', 'ghi-789', 'abc-456']

if any("abc" in s for s in xs):
    print("Substring found")

Filtering for Substring Matches

To retrieve all elements containing the substring, we can employ list comprehension in conjunction with if:

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

print(matching)  # Output: ['abc-123', 'abc-456']

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