带SQLAlchemy的MySQL Regex查询中的括号

Question

I have a python application which searches a database using SQLAlchemy like so:

query = raw_input('Search: ')
db.session.query(Posts).filter(Posts.name.op('REGEXP')(r'[[:<:]]{}'.format(query))).all()

This works fine with my MySQL database with most characters however I have found some searches do not work.

• Searches that include ( without a ) following it somewhere after return an error
• Searches that contain foreign characters like Б , э , д or ц also returns an error

Is there a solution to support ALL kinds of search queries including special and foreign characters? Thanks.

Answer 1

Searches that include ( without a ) following it somewhere after return an error

This is happening since ( and ) have special meaning in regular expressions. The expression would not be valid, if, for example, there is an opening parenthesis without a closing one:

>>> re.compile(r"test (")
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  ...
error: unbalanced parenthesis

You need to escape the query :

import re

query = re.escape(query)