Yes, it is possible to combine two or more patterns into a single regular expression. This is often done using alternation, which is denoted by the vertical bar character |. The | character functions like a logical OR operator, allowing you to specify multiple possible patterns.

Here's an example of how to combine two patterns into a single regular expression:

regex
pattern1|pattern2

In this example, pattern1 and pattern2 are the two patterns that you want to combine. You can replace them with any valid regular expressions. The | character separates the two patterns and allows the regular expression engine to match either one.

For example, if you want to match either "dog" or "cat", you could use the following regular expression:

regex
dog|cat

This regular expression will match any string that contains either "dog" or "cat", such as "I have a dog" or "The cat is sleeping".

You can also use parentheses to group patterns together and apply modifiers or quantifiers to the entire group. For example, if you want to match either "dog" or "cat" followed by "s", you could use the following regular expression:

regex
(dog|cat)s

This regular expression will match any string that contains either "dogs" or "cats", such as "I have three dogs" or "The cats are playing".

Note that when combining patterns, it's important to consider the order in which they are listed. The regular expression engine will try to match the patterns from left to right, and will stop as soon as it finds a match. So, if you have two patterns that could potentially match the same text, you should list the more specific pattern first, followed by the more general pattern.

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