问题
In my case the delimiter string is ' ' (3 consecutive spaces, but the answer should work for any multi-character delimiter), and an edge case text to search in could be this:
'Coord="GLOB"AL Axis=X Type="Y ZR" Color="Gray Dark" Alt="Q Z"qz Loc=End'
The solution should return the following strings:
Coord="GLOB"AL
Axis=X
Type="Y ZR"
Color="Gray Dark"
Alt="Q Z"qz
Loc=End
I've looked for regex solutions, evaluating also the inverse problem (match multi-character delimiter unless inside quotes), since the re.split command of Python 3.4.3 allows to easily split a text by a regex pattern, but I'm not sure there is a regex solution, therefore I'm open also to (efficient) non regex solutions.
I've seen some solution to the inverse problem using lookahead/lookbehind containing regex pattern, but they did not work because Python lookahead/lookbehind (unlike other languages engine) requires fixed-width pattern.
This question is not a duplicate of Regex matching spaces, but not in "strings" or similar other questions, because:
- matching a single space outside quotes is different from matching a multi-character delimiter (in my example the delimiter is 3 spaces, but the question is about any multi-character delimiter);
- Python regex engine is slightly different from C++ or other languages regex engines;
- matching a delimiter is side B of my question, the direct question is about splitting a string.
回答1:
x='Coord="GLOB"AL Axis=X Type="Y ZR" Color="Gray Dark" Alt="Q Z"qz Loc=End'
print re.split(r'\s+(?=(?:[^"]*"[^"]*")*[^"]*$)',x)
You need to use lookahead to see if the space it not in between ""
Output ['Coord="GLOB"AL', 'Axis=X', 'Type="Y ZR"', 'Color="Gray Dark"', 'Alt="Q Z"qz', 'Loc=End']
For a generalized version if you want to split on delimiters not present inside "" use
re.split(r'delimiter(?=(?:[^"]*"[^"]*")*[^"]*$)',x)
来源：https://stackoverflow.com/questions/32117330/python-split-string-by-a-multi-character-delimiter-unless-inside-quotes