python .replace() regex [duplicate]
No. Regular expressions in Python are handled by the re module. In general:
regex
What is a Context Free Grammar?
A context free grammar is a grammar which satisfies certain properties. In computer science, grammars describe languages; specifically, they describe formal languages. A formal language is just a set (mathematical term for a collection of objects) of strings (sequences of symbols… very similar to the programming usage of the word “string”). A simple example of … Read more
Using or ‘|’ in regex [duplicate]
It’s because you are trying to match against the entire string instead of the part to find. For example, this code will find that only a part of the string is conforming to the present regex: When you want to match an entire string and check if that string contains he|be|de use this regex .*(he|be|de).* . means … Read more
OR condition in Regex
Try or add a positive lookahead if you don’t want to include the trailing space in the match When you have two alternatives where one is an extension of the other, put the longer one first, otherwise it will have no opportunity to be matched.
How is the AND/OR operator represented as in Regular Expressions?
I’m going to assume you want to build a the regex dynamically to contain other words than part1 and part2, and that you want order not to matter. If so you can use something like this: Positive matches: Negative matches: