How to retrieve javascript variable in HTML script using Python Regex?

Question

<script>
    function foo() {
        var bar = 'thisisvalue';
    }   
</script>

Hi all, I have this function in script tag and I want to get the value of var bar by using Python regular expression. Can anyone help me with this. Thanks

Are you sure the text var bar = won't appear elsewhere in the page? — John Gordon
– John Gordon, Commented Aug 24, 2018 at 23:58
Current code/approach ..? There are multiple steps, "get html as string", "apply regex to extract value", etc. Questions should generally provide code so that a single step can be focused on and explained in context what the current context. Both of the steps isolated above are already covered in countless tutorials. — user2864740
– user2864740, Commented Aug 25, 2018 at 0:00

Jon Sorenson · Accepted Answer · 2018-08-25 00:10:49Z

1

The pattern I always use in python is this:

import re
SEARCHER = re.compile( *regex with captured groups* )

...later, in a loop over lines...

  search = SEARCHER.search(line)
  if search:
     value = search.group(1)

In your particular case it would be something like this:

import re
VARBAR_SEARCHER = re.compile(r"var bar = '([^']*)'")

...

  search = VARBAR_SEARCHER.search(line)
  if search:
     value = search.group(1)

This omits the single quotes from the value. If you wanted those in there you could modify the regular expression.

answered Aug 25, 2018 at 0:10

Jon Sorenson

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Comments

John Gordon · Accepted Answer · 2018-08-25 00:42:21Z

0

for line in html:
     if 'var bar =' in line:
         thisisvalue = line.split("'")[1]

answered Aug 25, 2018 at 0:42

John Gordon

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