How do I replace whitespaces with underscore?
I want to replace whitespace with underscore in a string to create nice URLs. So that for example:
"This should be connected" becomes "This_should_be_connected"
I am using Python with Django. Can this be solved using regular expressions?
You don't need regular expressions. Python has a built-in string method that does what you need:
mystring.replace(" ", "_")
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Replacing spaces is fine, but I might suggest going a little further to handle other URL-hostile characters like question marks, apostrophes, exclamation points, etc.
Also note that the general consensus among SEO experts is that dashes are preferred to underscores in URLs.
import re def urlify(s): # Remove all non-word characters (everything except numbers and letters) s = re.sub(r"[^\w\s]", '', s) # Replace all runs of whitespace with a single dash s = re.sub(r"\s+", '-', s) return s # Prints: I-cant-get-no-satisfaction" print(urlify("I can't get no satisfaction!"))
Django has a 'slugify' function which does this, as well as other URL-friendly optimisations. It's hidden away in the defaultfilters module.
>>> from django.template.defaultfilters import slugify >>> slugify("This should be connected") this-should-be-connected
This isn't exactly the output you asked for, but IMO it's better for use in URLs.
This takes into account blank characters other than space and I think it's faster than using
url = "_".join( title.split() )
import re re.sub('\s+', '_', "This should be connected") # This_should_be_connected re.sub('\s+', '_', 'And so\tshould this') # And_so_should_this
Unless you have multiple spaces or other whitespace possibilities as above, you may just wish to use
string.replace as others have suggested.
use string's replace method:
"this should be connected".replace(" ", "_")
"this_should_be_disconnected".replace("_", " ")