Remove chars in a string Django python - django

When I post a value from my page an extra string is create and I would like to remove the 'pattern = "' is there a tag i could use or replace function i can use to remove pattern =" and the ending ". Please find below scenario:
pattern = "apple"
Desired output
apple
I tried using but to no success.Is there another method i could use newbie at django python.
{{ pattern|split }}


Write a custom templatetag and use a regular expression (a capture group would do the trick) to replace the desired part.


If the quotation marks are added to your string when you are submitting the form, you could use the .strip() method when accessing the POST data. You can also specify what characters you want to remove. Check it out here: http://docs.python.org/2/library/stdtypes.html

Related

Regex PCRE capture multiple occurences query string in URL

I am trying to capture multiple occurence of utm tag in a URL and append when re-writing the url. However i just want utm key values and skip others.
This is a sample URL
https://example.com/dl/?screen=page&title=SABC&page_id=4063&myvalue=Noidea&utm_source=sourceTest19&utm_medium=mediumTest19&utm_campaign=campaignTest19&utm_term=termTest19&test=value&utm_content=contentTest19
I tried this:
(\?.*)(page_id=([^&]*))(\?|&)(.*[&?]utm_[a-z]+=([^&]+).*)
and unfortunately, it doesn't produce the result I expect.
I need to capture PAGE ID and utm tags both, but do not want test=value, myvalue=Noidea and only want query strings with utm tags.
Expected Result is the URL below:
https://example.com/dl/page_id/4063?utm_source=sourceTest19&utm_medium=mediumTest19&utm_campaign=campaignTest19&utm_term=termTest19&utm_content=contentTest19
one group with pageid=<somenumber/text>
one group with all utm tags with key and value
Help will be appreciated.

You can make regex like this to get group result:
(?:(page_id|utm_[a-z]+)=[A-z0-9]+)(?:^\&)?

You can instead replace any parameter that does not match the desired ones with the empty string. The pattern for this is
(?:[?&](?!(?:page_id|utm_[^=&]++)=)[^&]*+)++$|(?<=[?&])(?!(?:page_id|utm_[^=&]++)=)[^&]*+(?:&|$)
Here's a working proof: https://regex101.com/r/L5xcl4/2 It has an extra \s only so it works on the multiline input in the tester, but you shouldn't need it as you'll be working on a string that contains only a URL without whitespace.

Postgres: remove second occurrence of a string

I tried to fix bad data in postgres DB where photo tags are appended twice.
The trip is wonderful.<photo=2-1-1601981-7-1.jpg><photo=2-1-1601981-5-2.jpg>We enjoyed it very much.<photo=2-1-1601981-5-2.jpg><photo=2-1-1601981-7-1.jpg>
As you can see in the string, photo tags were added already, but they were appended to the text again. I want to remove the second occurrence: . The first occurrence has certain order and I want to keep them.
I wrote a function that could construct a regex pattern:
CREATE OR REPLACE FUNCTION dd_trip_photo_tags(tagId int) RETURNS text
LANGUAGE sql IMMUTABLE
AS $$
SELECT string_agg(concat('<photo=',media_name,'>.*?(<photo=',media_name,'>)'),'|') FROM t_ddtrip_media WHERE tag_id=tagId $$;
This captures the second occurrence of a certain photo tag.
Then, I use regex_replace to replace the second occurrence:
update t_ddtrip_content set content = regexp_replace(content,dd_trip_photo_tags(332761),'') from t_ddtrip_content where tag_id=332761;
Yet, it would remove all matched tags. I looked up online for days but still couldn't figure out a way to fix this. Appreciate any help.

This Should Work.
Regex 1:
<photo=.+?>
See: https://regex101.com/r/thHmlq/1
Regex 2:
<.+?>
See: https://regex101.com/r/thHmlq/2
Input:
The trip is wonderful.<photo=2-1-1601981-7-1.jpg><photo=2-1-1601981-5-2.jpg>We enjoyed it very much.<photo=2-1-1601981-5-2.jpg><photo=2-1-1601981-7-1.jpg>
Output:
<photo=2-1-1601981-7-1.jpg>
<photo=2-1-1601981-5-2.jpg>
<photo=2-1-1601981-5-2.jpg>
<photo=2-1-1601981-7-1.jpg>

How do we include a variable in escaped double quotes?

I'm using Node.js and MongoDB, and I'm trying to perform a $search on a $text field from a collection. As mentioned in the docs, To match on a phrase, as opposed to individual terms, enclose the phrase in escaped double quotes (\"), as in:
"\"ssl certificate\""
I have a variable query that holds the value inputted by a user in a simple text search application. I want to add this query as a phrase, so that I can perform my search on all the words entered by the user appropriately.
Is there anyway one can achieve this?

assuming the user input is in the variable input you can add double qoutes around it like so:
input = '"'+input+'"';
this string, you should then be able to use in your $search.
If you post your code, I could try to give a more specific answer.

Instead of using regex of the format /regexString/g you can also create Regex objects using variables.
var regexExp = new RegExp(query,"g");
You can use this regexExp to search.

Django custom template filter to highlight a column in a block of text

I'm rendering a list in an HTML template using {{ my_list | join:"<\br>"}} , and it appears as...
$GPGGA,062511,2816.8178,S,15322.3185,E,6,04,2.6,72.6,M,37.5,M,,*68
$GPGGA,062512,2816.8177,S,15322.3184,E,1,04,2.6,72.6,M,37.5,M,,*62
$GPGGA,062513,2816.8176,S,15322.3181,E,1,04,2.6,72.6,M,37.5,M,,*67
$GPGGA,062514,2816.8176,S,15322.3180,E,1,03,2.6,72.6,M,37.5,M,,*66
$GPGGA,062515,2816.8176,S,15322.3180,E,6,03,2.6,72.6,M,37.5,M,,*60
I am attempting to use regular expressions to insert the CSS at the 4th and 5th commas so I can highlight the text in this column, however I'm not able to figure out the expression to do this. Other methods to achieve this also appreciated.
Other info:
1) each line ends with a '\n'. Although this can be removed and the HTML display is unchanged, I've left it in for the regular expression to use if required.
2) The string will not always have a nice header such as '$GPGGA' in this example, although I could add one to help ID the start of the line if required by the regex.
3) The columns may not be a uniform number of characters as indicated in this example.
The filters I'm working on are as follows
#register.filter(is_safe=True)
def highight_start(text):
return re.sub('regex to find 4th comma in each line', ",<span class='my_highlight'>", text, flags=re.MULTILINE)
#register.filter(is_safe=True)
def highight_end(text):
return re.sub('regex to find 5th comma in each line', "</span>,", text, flags=re.MULTILINE)
Regards

You can achieve that by replacing the 5th value with the value itself wrapped in your <span> tags.
RegEx: ^((?:[\w\d\.\$]+,){4})([\d\.]+)
Replacement: \1<span class='my_highlight'>\2</span>
Explained demo here: http://regex101.com/r/cX5iA0
Note: I assumed the 5th value will be digits and dots

Thanks #ka, who got me ontrack with this solution. My working filter uses:
expression = '^((?:[^,]+,){4})([^,]+)'
replace = r'\g<1><span class="my_highlight">\g<2></span>'
#[^,] also allows matching of hidden HTML tags in the text
#To get the groups to insert back into the text and not be overwritten, they need to be referenced as indicated in 'replace'.

Regex Assistance for a url filepath

Can someone assist in creating a Regex for the following situation:
I have about 2000 records for which I need to do a search/repleace where I need to make a replacement for a known item in each record that looks like this:
<li>View Product Information</li>
The FILEPATH and FILE are variable, but the surrounding HTML is always the same. Can someone assist with what kind of Regex I would substitute for the "FILEPATH/FILE" part of the search?

you may match the constant part and use grouping to put it back
(<li>View Product Information</li>)
then you should replace the string with $1your_replacement$2, where $1 is the first matching group and $2 the second (if using python for instance you should call Match.group(1) and Match.group(2))
You would have to escape \ chars if you're using Java instead.