A lookbehind is a part of the regular expression standard.
For example, in this text: Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc eu tellus vel nunc pretium lacinia. …
regex lookbehind word-boundaryI am trying to use lookbehinds in a regular expression and it doesn't seem to work as I expected. So, …
regex lookbehindFor example,the regex below will cause failure reporting lookbehind assertion is not fixed length: #(?<!(?:(?:src)|(?:href))=["\']?)((?:https?|…
regex pcre lookbehindI need to match the string "foo" from a string with this format: string = "/foo/boo/poo" I tied this …
regex regex-lookarounds lookbehindI have this pattern written ^.*\.(?!jpg$|png$).+$ However there is a problem - this pattern matches file.name.jpg (2 dots) …
python regex lookbehindI get this error: java.util.regex.PatternSyntaxException: Look-behind group does not have an obvious maximum length near index 22 ([a-z])(?!.*\1)(?&…
java regex lookbehindI've almost got the answer here, but I'm missing something and I hope someone here can help me out. I …
regex lookbehind lookaheadHow can I use lookbehind in a C# Regex in order to skip matches of repeated prefix patterns? Example - …
c# regex lookbehindI created a test using grep but it does not work in sed. grep -P '(?<=foo)bar' file.…
regex sed grep lookbehindIs there a way to do negative and positive lookbehind in VBA regex? I want to not match if the …
regex vba lookbehind negative-lookbehind