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QUESTION
I have a large string file seq.txt
of letters, unwrapped, with over 200,000 characters. No spaces, numbers etc, just a-z.
I have a second file search.txt
which has lines of 50 unique letters which will match once in seq.txt
. There are 4000 patterns to match.
I want to be able to find each of the patterns (lines in file search.txt
), and then get the 100 characters before and 100 characters after the pattern match.
I have a script which uses grep and works, but this runs very slowly, only does the first 100 characters, and is written out with echo. I am not knowledgeable enough in awk or perl to interpret scripts online that may be applicable, so I am hoping someone here is!
...ANSWER
Answered 2020-Nov-10 at 09:17One way
QUESTION
I need to parse a CHANGELOG in Keep a changelog format with grep (or awk, etc in shell/bash) and get the last version (the first one after [Unreleased] tag).
It means, split this file with block '\n## ', ignore the first ([Unreleased]) and get the second (if exists).
With nodeJS, it's very easy and readable CHANGELOG.split(/\n## /)[2];
But I can't make it work with grep ... grep -zoP -m 1 "(\n## .*)(\n## .*)?(\n## )?" CHANGELOG.md
I can't make the regex match group with multiline even using (.|\n)+
Since I'm on it since few days and trying again and again, the Machine Learning found this ##(?:[^be]+[^#]*###)+[^#]*
but, it looks like too heavy for just "block split with \n##
".
ANSWER
Answered 2020-Jul-29 at 09:27Ed can do this.
QUESTION
I am trying to search for a regex with lookahead its not working in pcregrep or grep
I want to search for bits of sections
- which may span over multiple lines,
- which start with PQXY at the beginning of a line and
- end with OFEJ at the end of the line and
- does not contain either PQXY or OFEJ in between
Generall i use the following in sublime text find and works well
...ANSWER
Answered 2020-Feb-24 at 05:59
zsh: event not found: PQXY|OFEJ).)
Since this is zsh
raising the error, it's almost certainly because it's trying to process the stuff within the double quotes. To protect it from that, you should use single quotes, such as:
QUESTION
I am trying to get live updates on my redis ordered list without success. It seems like it fetches all the items and just ends on the last item. I would like the client to keep get updates upon a new order in my ordered list. What am I missing?
This is my code:
...ANSWER
Answered 2019-Oct-27 at 00:28There is no such feature in Redis. First, reactive retrieval of a sorted set is just getting a snapshot, but your calls are going in a reactive fashion. So you need a subscription instead.
If you opt in for keyspace notifications
like this (K - enable keyspace notifications, z - include zset commands) :
QUESTION
I have tried to read text from image of receipt using pytesseract. But a result text have a lot weird characters and it really looks awful. There is my code which i used to manipulate image:
...ANSWER
Answered 2019-Mar-13 at 11:01Applying simple thresholding will not be enough for pyTesseract to properly detect the characters. There is much more preprocessing that can be done to drastically improve your results, such as:
- using Tesseract V4, where deep learning is implemented
- segmenting characters
- using only the part of the receipt where the text is through edge detection
- perspective transform to straighten out the text
These are somewhat lengthy topics to write all in one answer, but you can check out some articles on pyImageSearch, where this is talked about in much more depth:
https://www.pyimagesearch.com/2014/09/01/build-kick-ass-mobile-document-scanner-just-5-minutes/ https://www.pyimagesearch.com/2018/09/17/opencv-ocr-and-text-recognition-with-tesseract/
QUESTION
As part of a load test, I've a file with a generated list of requests. The format is below, in that, the payload is in between two newline characters; the GET indicating the start of a new request. I would like to extract only the payload.
...ANSWER
Answered 2018-Nov-05 at 16:44Use awk
to match a blank line, get the next line and print it, then skip the next line (which should always be blank).
QUESTION
I have a file cases
:
ANSWER
Answered 2018-Oct-28 at 16:35I thought it was a bug, but I was pointed out that \s
, which is a synonym for the POSIX character class [:space:]
corresponds to [ \t\n\r\f\v]
in the C locale and therefore also matches the preceding newline here.
QUESTION
I'm writing some code to simulate a quantum computer in python. I just added a section which starts integrating greater-than-one-qubit functionality, and then this weird error came up. It doesn't say anything about which line caused it, so I don't really even know where to start fixing it, and I've never seen it before. Further, the program keeps running and outputs the correct answer in the few testcases I've run, even with this error.
Error ...ANSWER
Answered 2017-Sep-17 at 22:15It doesn't say anything about which line caused it, so I don't really even know where to start fixing it, and I've never seen it before.
An easy way would be to promote warnings to exceptions and then use a debugger to inspect the variables.
So you could prepend this:
QUESTION
My book says -
Strings and lists are actually similar, if you consider a string to be a “list” of single text characters.
Suppose that I have a string namely
name=Zophie
.
Now this string should have some resemblance with a list. So I type in another code that would tell me what should the items of that list be. The code goes like -
for i in name:
print(‘* * * ‘ + i + ‘ * * *')
The output is:
* * * Z * * *
* * * o * * *
* * * p * * *
* * * h * * *
* * * i * * *
* * * e * * *
This clearly shows that the list items of name
are Z,o,p,h,i,e.
Now if I try to check wether the list has an item ’Zop'
by using:
Zop in name
It returns True! That is, Python says that Zophie contains an item namely ’Zop’
but when I tried to list all the items using the for command, Zop
didn’t show up.
What’s happening here?
...ANSWER
Answered 2017-Jun-18 at 01:59Any Python class is free to define various operations however it likes. Strings happen to implement the sequence protocol (meaning that iteration and [i]
item access behave the same as lists), but also implement __contains__
, which is responsible for x in y
checks, to look for substrings rather than just single characters.
It is common for x in y
membership testing to mean "x will appear if you print all the elements of y", but there's no rule saying that that has to be the case.
QUESTION
I posted an answer for this question where the OP wants a regex to match different blocks of JSON-esque data with a condition that one of the properties has a specific value.
Simplifying the question a little bit - assume some sample data like this:
...ANSWER
Answered 2017-Feb-05 at 17:10You do not need the positive lookahead, use capturing and stack with conditional check:
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