CODEWITHSUNDEEP
pythonregex
Mr.D
Mr.D

Reputation: 91

Get mathematical expressions (single letters, numbers, equations...) using regex (in python)

I'm new to regex and would like to match (in my python-programm) mathematical expressions in a string using regex. Mathematical expressions are for me (now) single letters, numbers and expressions between square brackets. So e.g. for the given sentence (=string)

"Let f(a) in the variable a be 100 in the expression [[f(a)=a+1]]."

I'd like to get something like:

[f(a),a,100,f(a)=a+1]

I managed to get

1, the expression in the squared brackets using [[(.*?)]]
2, single letters and numbers using \b[0-9a-zA-Z]{1}\b and
3, numbers generally using \d+

, but not to get everything with one regular expression.

May someone help with an appropriate regex-module or would it be better to solve this problem in a pythonic way?

Upvotes: 2

Views: 1328

Answers (2)

Mr.D
Mr.D

Reputation: 91

Finally I got it. Thanks to everyone! You made my day.

Thats my regular expression:

'(?<=[ ][[]{2}).*?(?=[]]{2}[ .!?])|\d+|\b[a-zA-Z0-9{+-}]*\([a-zA-Z0-9{+-}]*\)|\b[a-zA-Z]\b'

Upvotes: 0

Jorge.V
Jorge.V

Reputation: 1347

This will capture your mathematical expressions disregarding the number of brackets (?<=\[)[^\[]*?(?=\])

Check a demo here regex101

To get a list in python with your math expressions, you can use the following code:

p = re.compile('(?<=\[)[^\[]*?(?=\])')

p.findall('YOUR TEXT HERE')

Upvotes: 2

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