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Here is an example of negative lookahead assertion in regular expression using Python: import re strings = ['foo', 'bar', 'baz', 'foo-bar', 'bar-baz', 'baz-foo'] matches = [s for s in strings if re.search('^(?!.*foo)', s)] print(matches) The regular expression ^(?!.*foo) in the above example matches strings that do not contain the pattern...

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Introduction In mathematics, a function \( f \) from a set \( X \) to a set \( Y \) is a relation that associates each element of \( X \) with exactly one element of \( Y. \) This page describes the commonly used notation, terminology, and concepts pertaining to functions. Contents Introduction Definition Notation Domain,...

Guess My RGB, the little colour guessing game, just got a small update. This update adds a "Mode" link to the footer which can be used to toggle the game between normal mode and expert mode. The expert mode was introduced as a hidden feature five months ago in the previous release. With the current release, the expert mode no longer...

Real Analysis Meeting time: 19:00 UTC on Saturdays and Sundays usually.† Meeting duration: 40 minutes. Meeting link: susam.net/meet Meeting log: click here Reference book: Real Analysis by John M. Howie (2001) Chapter notes: ch01.html Club channel: ...