Yes, you can use regex to match a certain number of characters before a specific string by using the positive lookbehind assertion. For example, if you want to match 3 characters before the string "hello", you could use the following regex:
(?<=.{3})hello
To use curly braces in reverse, you could use the negative lookbehind assertion. For example, if you want to match "world" only if it is not preceded by 2 or more digits, you could use the following regex:
(?<!\d{2,})world
This will match "world" only if it is not immediately preceded by two or more digits.
Please start posting anonymously - your entry will be published after you log in or create a new account. This space is reserved only for answers. If you would like to engage in a discussion, please instead post a comment under the question or an answer that you would like to discuss
Asked: 2023-05-11 14:43:18 +0000
Seen: 11 times
Last updated: May 11 '23
How can a regular expression be crafted to leave out a string that has a particular size?
In order to match the page with Tampermonkey, how can I disregard all the forward slashes?
How can I use regex to match only numbers and commas?
What are the steps to perform index match and maxifs functions in Google Sheets?
How can the conversion of a String to LocalDate be unsuccessful?
How can certain patterns be mapped to c# Regex in c#?
Regex Pattern to match all characters before the first ":" in Python