适用于逻辑运算符的Python正则表达式

Question

I am developing a rule system which can accept relational and logical operators.

A simple expression in the rule system could be as simple as

EmployeeAgeProperty >= IntegerProperty:27

where I define what would substitute the EmployeeHireDateProperty and my rulesystem will evaluate that. Assume that each simple expression like above would evaluate to a true/false. My regex for this would be

(?P<lhs>[AZ][a-zA-Z]*Property):{0,1}(?P<lhsPrimitiveValue>[A-Za-z0-9]*)\\ *(?P<operator>[><=]|!=|<=|>=|in|not_in)\\ *(?P<rhs>[AZ][a-zA-Z]*Property):{0,1}(?P<rhsPrimitiveValue>[A-Za-z0-9]*)

lhs = Left Hand Side
rhs = Right Hand side.

Now, I want to combine number of simple expressions into compound expressions via logical operators And/Or(lets assume Not is out of context).

So, a valid compound expression would be

SimpleExpression1 and SimpleExpression2 or SimpleExpression3 where each simple expression inturn would match the above regex.

I want my regex group to return ('SimpleExpression1', 'and', SimpleExpression2', 'or', 'SimpleExpression3')

I could comeup with something like this

([\\w\\d!=< ]*)\\ *(and|or)\\ *([\\w\\d!=< ]*) which would match a single compound expression with one and/or. But couldn't able to expand further.

Answer 1

Maybe you want to try re.split , see also this question.

re.split('(and|or)', 'this and this or that')
Out[18]: ['this ', 'and', ' this ', 'or', ' that']