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python Programming Glossary: lookbehindImpossible lookbehind with a backreference http://stackoverflow.com/questions/10279055/impossible-lookbehind-with-a-backreference lookbehind with a backreference From my understanding . 1 should never.. Bz Note that unlike pcre regex also allows variable width lookbehinds print regex.sub r' . A Z ' r' g 0 ' test ## x AAAAA y BBBB.. with the fact that Python does not support variable length lookbehind assertions but it's not clever enough to figure out that 1 will..
Match exactly N repetitions of the same character http://stackoverflow.com/questions/10319696/match-exactly-n-repetitions-of-the-same-character this question Use negative lookahead and negative lookbehind. This would be the regex . 1. 1 N 1 1 except that Python's re.. are broken in that you can't use backreferences in a lookbehind assertion. Lookbehind assertions are required to be constant.. This lets the regex engine know exactly the width of the lookbehind assertion so it works in PCRE and re and so on. Of course a..
Python/Regex - Match .#,#. in String http://stackoverflow.com/questions/12608152/python-regex-match-in-string To allow for multiple consecutive matches use lookahead lookbehind r' . d d . ' Example re.findall r' . d d . ' 'Test7.5 6.7 8.test'..
python re.split() to split by spaces, commas, and periods, but not in cases like 1,000 or 1.50 http://stackoverflow.com/questions/12683201/python-re-split-to-split-by-spaces-commas-and-periods-but-not-in-cases-like this question Use a negative lookahead and a negative lookbehind s one two 3.4 5 6 seven.eight nine ten parts re.split ' s d..
Why doesn't finite repetition in lookbehind work in some flavors?p http://stackoverflow.com/questions/3159524/why-doesnt-finite-repetition-in-lookbehind-work-in-some-flavorsp doesn't finite repetition in lookbehind work in some flavors p I want to parse the 2 digits in the.. or am I wrong Thanks for any help. c# java python regex lookbehind share improve this question On lookbehind support Major.. python regex lookbehind share improve this question On lookbehind support Major regex flavors have varying supports for lookbehind..
Regex for managing escaped characters for items like string literals http://stackoverflow.com/questions/430759/regex-for-managing-escaped-characters-for-items-like-string-literals that. I wanted a solution like the following but negative lookbehind assertions need to be fixed length # ... re.compile r ' . '..
Perl Compatible Regular Expression (PCRE) in Python http://stackoverflow.com/questions/7063420/perl-compatible-regular-expression-pcre-in-python s outstanding features of interest are Variable width lookbehind a feature which is quite rare in regex engines and very frustrating..
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