CODEWITHSUNDEEP
javascriptpythonregex
cool_jesus
cool_jesus

Reputation: 197

Regular expression to find id from JavaScript

I have some JavaScript code in string format. Target is such a string:

productPage.loadProductData("138674", "initial", "1");

How can I extract '138674'?

I'm using this line:

from re import search as re_search, sub as re_sub, compile as re_compile
print re_search(r'productPage.loadProductData("?P<pid>\d+","?P<x>\w+","?P<n>\d+");', open_link).groupdict()["pid"]

Upvotes: 0

Views: 96

Answers (3)

Avinash Raj
Avinash Raj

Reputation: 174756

In Python (?P<name>regex) is called a named capturing group. You forgot the opening and closing brace in the named capturing group. And also you need to escape ( in your regular expression to match a literal ( symbol.

>>> s = 'productPage.loadProductData("138674","initial","1");'
>>> print re.search(r'productPage.loadProductData\("(?P<pid>\d+)","(?P<x>\w+)","(?P<n>\d+)"\);', s).group("pid")
138674

OR

>>> print re.search(r'productPage.loadProductData\("(?P<pid>\d+)","(?P<x>\w+)","(?P<n>\d+)"\);', s).groupdict()["pid"]
138674

Upvotes: 1

atrifan
atrifan

Reputation: 172

Why do you want to do a regular expression on code, and don't use a specialized library to parse code - for example Esprima?

Esprima parses code and outputs it in JSON format so you can now extract the name of the functions, the variables passed to it, etc.

Upvotes: 0

alecxe
alecxe

Reputation: 474003

Aside from the regular expression-based approach, you can solve it with a slimit JavaScript parser:

from slimit.ast import String
from slimit.parser import Parser
from slimit.visitors import nodevisitor

data = 'productPage.loadProductData("138674","initial","1");'

parser = Parser()
tree = parser.parse(data)
print next(node.value for node in nodevisitor.visit(tree) if isinstance(node, String))

This would output the first String node out of the JavaScript code in the data variable.

Upvotes: 0

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