Python正则表达式跨行匹配

Question

I have a bibtex file formatted like this:

@inproceedings{baz,
    AUTHOR={{Baz}, {S}. and Bar, {G}. and
      Foo, {M}},
    year={2013}
}

I have managed to capture a single entry (the entire text shown above), but I want a regex in Python that matches everything inside the AUTHOR={} brackets (across the newline). How can I do this in Python?

Answer 1

re.compile(r"AUTHOR={([\sA-Za-z{},\.]+)},$", re.MULTILINE)

Answer 2

You can use the following regex that checks for 1 level of nested curly braces:

(?ims)author\s*=\s*[{"]((?:[^{}]+?|{[^}]+?})+?)[}"]

See demo

Sample code on IDEONE :

import re
p = re.compile(r'(?ims)author\s*=\s*[{"]((?:[^{}]+?|{[^}]+?})+?)[}"]')
test_str = "@inproceedings{baz,\n    AUTHOR = {{Baz}, {S}. and Bar, {G}. and\n      Foo, {M}},\n    year={2013}\n}\n@inproceedings{baz,\n    AUTHOR={{%Baz%}, {S!}. and Bar, {^G^}. and\n      Foo, {<M>}},\n    year={2013}\n}\n"
print [x.group(1) for x in re.finditer(p, test_str)]