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https://stackoverflow.com/questions/9197814/regex-lookahead-for-not-followed-by-in-grep
Regex lookahead for 'not followed by' in grep. Ask Question Asked 7 years, 9 months ago. ... Negative lookahead, which is what you're after, ... If you like perl-compatible regular expressions and have perl but don't have pcregrep or your grep doesn't support --perl-regexp, you can you one-line perl scripts that work the same way like grep: ...
https://www.rexegg.com/regex-lookarounds.html
(However, it does not work in Ruby as Ruby does not allow lookaheads and negative lookbehinds inside lookbehind.) Another interesting feature is how the notion of "current position in the string" is not the same for the lookbehind and for the lookahead.
https://wangpidong.blogspot.com/2011/07/does-sed-support-lookahead-or.html
Jul 05, 2011 · after investigating for a while, finally I found sed does not support lookahead or lookbehind assertions. Based on http://sed.sourceforge.n...Location: Palo Alto, CA, United States
https://caspar.bgsu.edu/%7Ecourses/Stats/Labs/Handouts/grepadvanced.htm
Advanced Grep Topics If you are new to grep, it is possible that the topics covered in this section will not make much sense to you. That's OK. The best way to learn grep is to use it in real life, not by reading example patterns. In many cases, the basic grep syntax covered previously in this chapter will be all that you need. Matching Nulls
https://unix.stackexchange.com/questions/183174/what-types-of-regex-do-support-e-g-negative-lookbehind
I knew just a perl invocation of regex to support lookbehind (negative included). I have met it in grep with -P option but not sure for find and other command. Format of expressions you can find in man pcre.But I am sure that for more cases there are many ways to omit pcre usage in find or somewhere else.
https://unix.stackexchange.com/q/379077
Negative lookahead on multiple strings. Ask Question Asked 2 years, ... How does one properly use a negative lookahead in GNU grep? CentOS 7.3 (KDE desktop), GNU grep 2.20 ... Does bash not pass the same input to grep after interpreting the line? – dotancohen Jul 17 '17 at 17:31.
https://www.regular-expressions.info/refadv.html
Regular Expression Reference: Special Groups ... except that negative lookahead only succeeds if the regex inside the lookahead fails to match. t ... Please make a donation to support this site, and you'll get a lifetime of advertisement-free access to this site! Page URL: ...
https://community.adobe.com/t5/indesign/positive-lookahead-not-working/td-p/8730382
Solved: Hi All, I am trying to use positive lookahead in my script but it does not give me the desired results, the grep expression however does work outside - 8730382. ... • In red, the NEGATIVE LOOKAHEAD (NL) ...
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