By inserting this regex in a programming language to test it against Codeforces 1800A you'll solve the task

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Validates client IDs

This pattern matches inconsistent addresses that have various street names and coordinates. This captures the Address 1 & 2, Type of Street, Coordinates (NE, NW, SE,SW) City, State, and Full zip

Ensure that Salesforce Flow name meets the following standards: - -

Validate comma-separated list of values (allowed: words; digits; special characters; single non-trailing non-leading spaces;)

Matches the data sent by the twitch IRC and captures into various groups

text has numbers

match some emails and extract their local part and domain