re: delete string onwards

[JohnnyCoffee]

I get a dynamic data string that I capture from the HTTP header, assigning a variable according to the example below:

lang = 'pt-br,pt;q=0.9,en-us;q=0.8,en;q=0.7,fr;q=0.6'

I need to delete the entire string (,pt;q=0.9,en-us;q=0.8,en;q=0.7,fr;q=0.6) leaving only the Language Content as the example:

pt-br

How to exemplify this using the regular expressions module in python (re) ?

[snippsat]

Can spilt at ;

>>> lang = 'pt-br,pt;q=0.9,en-us;q=0.8,en;q=0.7,fr;q=0.6'
>>> lang.split(';')[0]
'pt-br,pt'

As this is a HTTP Accept-Language header,so can contain more languages.
So then just spilt one more time at ,

>>> lang = 'en-US,fr-CA;q=0.9,en-us;q=0.8,en;q=0.7,fr;q=0.6'
>>> lang.split(';')[0]
'en-US,fr-CA'
>>> lang.split(';')[0].split(',')
['en-US', 'fr-CA']

Then this list of than can be checked if ok in not a 406 Not Acceptable status code can be send.

So are still working on your web-framework stuff?
As mention before this is very hard task with limited basic Python skill.

If you want some inspiration look at FastAPI .
It's by far the best new web-framwork for Python,it's a how a modern framework should be build.

[JohnnyCoffee]

Can spilt at ;

>>> lang = 'pt-br,pt;q=0.9,en-us;q=0.8,en;q=0.7,fr;q=0.6'
>>> lang.split(';')[0]
'pt-br,pt'

As this is a HTTP Accept-Language header,so can contain more languages.
So then just spilt one more time at ,

>>> lang = 'en-US,fr-CA;q=0.9,en-us;q=0.8,en;q=0.7,fr;q=0.6'
>>> lang.split(';')[0]
'en-US,fr-CA'
>>> lang.split(';')[0].split(',')
['en-US', 'fr-CA']

Then this list of than can be checked if ok in not a 406 Not Acceptable status code can be send.

So are still working on your web-framework stuff?
As mention before this is very hard task with limited basic Python skill.

If you want some inspiration look at FastAPI .
It's by far the best new web-framwork for Python,it's a how a modern framework should be build.

I even thank you for the collaboration but I need it to be in regex and have only the result (pt-br)

Yes, I'm still working on the web framework, soon I'll be publishing here in the community.

[snippsat]

As the format of Language header is always same can just split one more time no need for regex.

>>> lang = 'pt-br,pt;q=0.9,en-us;q=0.8,en;q=0.7,fr;q=0.6'
[python]>>> lang = 'pt-br,pt;q=0.9,en-us;q=0.8,en;q=0.7,fr;q=0.6'
>>> lang.split(';')[0].split(',')[0]
'pt-br'
>>> lang.split(';')[0].split(',')[1]
'pt'
>>> 
>>> lang = 'en-US,fr-CA;q=0.9,en-us;q=0.8,en;q=0.7,fr;q=0.6'
>>> lang.split(';')[0].split(',')[0]
'en-US'
>>> lang.split(';')[0].split(',')[1]
'fr-CA'

It's usually one or two languages specified or * any language.
Accept-Language