I have a simple issue: Using Alteryx, I want to take a string, match a certain pattern and return the matched pattern.
This is my current approach:
Regex_replace("CP:ConsumerProducts&Retail</td><td><strong><fontcl","[^\<]+","$1")
According to various sources and tools like regex101, the first matched sequence should be "CP:ConsumerProducts&Retail". However, Alteryx returns
<<<<
Alteryx uses the Perl RegEx Syntax (https://help.alteryx.com/2018.2/boost/syntax_perl.html), therefore, it should have no problem with the pattern itself.
I believe I am missing something obvious but I cannot figure it out.
I have received a reply through a different forum. A solution that works for me is to use the following pattern: ([^\<]+).*
You can try the following workflow:
Related
I would need a regex to match my files named "something".Title"numberFrom1to99".mp4 on Windows' File Explorer, my first approach as a regex newbie was something like
"..mp4"
, but it didn't work, so i tried
"*.Title[1-9][0-9].mp4"
, that also did not work.
I would also like a tip on how to search regex related advices on Stackoverflow archive but also on the web, so that i can be specific, but without having the regex in the searching bar interact.
Thank you!
EDIT
About the second part of the question: in the question itself there is written "..mp4" but i wrote "asterisk"."asterisk".mp4, is there any universal way to write regex on the web without it having effect and without escaping the characters? (in that way the backslash shows inside the regex, and that could be misunderstood)
Try something like this:
(.*)\.[A-za-z]+\d+\.mp4
See this Regex Demo to get an explanation on the regex.
Use regex101.com to test your regexs
Here it is:
^[\s\S]*\.Title[1-9][0-9]?\.mp4$
I suggest regexr.com to find many interesting regexes(Favourites tab) and simple tutorial.
About the second part of the question: in the question itself there is written "..mp4" but i wrote "asterisk"."asterisk".mp4, is there any universal way to write regex on the web without it having effect and without escaping the characters? (in that way the backslash shows inside the regex, and that could be misunderstood)
My college asked my to provide him with a regex that only matches if the test-string endswith
.rar or .part1.rar or part01.rar or part001.rar (and so on).
Should match:
foo.part1.rar
xyz.part01.rar
archive.rar
part3_is_the_best.rar
Should not match:
foo.r61
bar.part03.rar
test.sfv
I immediately came up with the regex \.(part0*1\.)?rar$. But this does match for bar.part03.rar.
Next I tried to add a negative look behind assertion: .*(?<!part\d*)\.(part\0*1\.)?rar$ That didn't work either, because look around assertions need to be fixed width.
Then I tried using a regex-conditional. But that didn't work either.
So my question: Can this even be solved by using pure regex?
An answer should either contain a link to regex101.com providing a working solution, or explain why it can't work by using pure regex.
You could use lookahead to verify the one case that fails your original regex (.rar with .part part that isn't 0*1) is discredited:
^(?!.*\.part0*[^1]\.rar$).*\.(part0*1\.)?rar$
See it in action
This is an old question, but here's another approach:
(?:\.part0*1\.rar|^(?<!\.)\w+\.rar)$
The idea is to match either:
A string that ends with .part0*1.rar (ie foo.part01.rar, foo.part1.rar, bar.part001.rar), OR
A string that ends with .rar and doesn't contain any other dots (.) before that.
Works on all your test cases, plus your extra foo.part19.rar.
https://regex101.com/r/EyHhmo/2
I am trying to make an if-then-else statement using RegEx. I want to match the text if it contains Monty and also contains Python. Also the text should get matched if Monty is not present in the text.
RegEx
(?(?=Monty)(?(?=Python).*|)|^.*).*$
Kindly help!
How about this:
(^(?!.*Monty(?!.*Python.*).*).*$|^.*Python.*Monty.*$)
This passes my tests, but let me know if it works for you.
I am not versed in lookahead regex but just tried to build the regex from what I understood from above description. Check the link to see if this is what you are trying to do.
try this instead
((?=Monty)((?=Python).*|)|^.*).*$
could you please give me some advice, I'm replacing the <chemform> code from my wiki which is not used any more... The strings are usually simple like these:
<chemform>CH3COO-</chemform>
<chemform>Ba2+</chemform>
<chemform>H2CO3</chemform>
I need them to be replaced by these:
CH<sub>3</sub>COO<sup>-</sup>
Ba<sub>2</sub><sup>+</sup>
H<sub>2</sub>CO<sub>3</sub>
So far I came up with this regexp for the RegExr tool:
match: <chemform\b[^>]*>(\D*?)([0-9]*)(\D*?)(\D*?)([0-9]*)(\D*?)([-+]*?)</chemform>
replace: $1<sub>$2</sub>$3$4<sub>$5</sub>$6<sup>$7</sup>
I know the code is horrible, but so far it's been working for me except for the fact it's getting me empty strings like <sub></sub>:
<sub></sub>CH<sub>3</sub>COO<sup>-</sup>
<sub></sub>Ba<sub>2</sub><sup>+</sup>
H<sub>2</sub>CO<sub>3</sub><sup></sup>
How can I get rid of these without doing second replace search? Thanks a lot!
You could use Notepad++, which is able to proceed to conditional replacements (you can have details in that previous post from Wiktor Stribiżew).
Use the following patterns:
match: ([A-Za-z]+(?=[-+\d]))(?<sub>\d+)?(?<sup>[-+])?(?=[-+\w]*</chemform>)
replace: $1(?{sub}<sub>$+{sub}</sub>)(?{sup}<sup>$+{sup}</sup>)
Given your input sample, I get:
<chemform>CH<sub>3</sub>COO<sup>-</sup></chemform>
<chemform>Ba<sub>2</sub><sup>+</sup></chemform>
<chemform>H<sub>2</sub>CO<sub>3</sub></chemform>
I have a string that looks like:
this is a string [[and]] it is [[awesome|amazing]]
I have the following regular expression so far:
(?<mygroup>(?<=\[\[).+?(?=\]\]))
I am basically trying to capture everything inside the brackets. However, I need to add another condition that says: If the matched result contains a pipe delimiter then only return the word to the right of the pipe delimiter. If there is no pipe then just return everything inside the brackets.
The parsing result I am looking for given the example above should look like:
and
amazing
Any input is appreciated.
(?<mygroup>(?<=\[\[)([^|\]]*|)?([^|]+?)(?=\]\]))
You could use this regex:
(?<=\[\[[^\]]*?)(?!\w+\|)\w+(?=\]\])
it matches both and and amazing words in your test example. You could check it out, I created a test app on Ideone.
From the regex info page:
The tremendous power and expressivity
of modern regular expressions can
seduce the gullible — or the foolhardy
— into trying to use regexes on every
string‐related task they come across.
My advice: Just grab what is between the brackets and parse it after.
Regular expressions are not the answer to everything. May those who follow after you be spared from deciphering the regex you come up with.