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QUESTION
GNU grep's basic (BRE) and extended (ERE) syntax is documented at https://www.gnu.org/software/grep/manual/html_node/Regular-Expressions.html and PCRE is summarized at man pcresyntax
, but there is no explicit comparison. What are the differences between GNU grep's basic/extended and PCRE (-P
) regular expressions?
ANSWER
Answered 2021-Jun-15 at 20:55My research of the major syntax and functionality differences from http://www.greenend.org.uk/rjk/tech/regexp.html:
.
in GNU grep does not match null bytes and newlines (but does match newlines when used with--null-data
), while Perl, everything except\n
is matched.[...]
in GNU grep defines POSIX bracket expressions, while Perl uses "character" classes. I'm not sure on the details. See http://www.greenend.org.uk/rjk/tech/regexp.html#bracketexpression- "In basic regular expressions the meta-characters
?
,+
,{
,|
,(
, and)
lose their special meaning; instead use the backslashed versions\?
,\+
,\{
,\|
,\(
, and\)
." From https://www.gnu.org/software/grep/manual/html_node/Basic-vs-Extended.html. ERE matches PCRE syntax. - GNU grep
\w
and\W
are the same as[[:alnum:]]
and[^[:alnum]]
, while Perl uses alphanumeric and underscore. - GNU grep has
\<
and\>
for start and end of word.
Perl supports much more additional functionality:
- "nongreedy {}" with syntax
re{...}?
- additional anchors and character types
\A
,\C
,\d
,\D
,\G
,\p
,\P
,\s
,\S
,\X
.\Z
,\z
. (?#comment)
- shy grouping
(?:re)
, shy grouping + modifiers(?modifiers:re)
- lookahead and negative lookahead
(?=re)
and(?!re)
, lookbehind and negative lookbehind(?<=p)
and(?
- Atomic groups
(?>re)
- Conditional expression
(?(cond)re)
- ... and more, see
man pcresyntax
QUESTION
I am having a dataset which contains the absolute HIV cases of four US State over 2 years.
There are three columns date
(Jan 2018, Feb 2018 ...) , state
(CA, NY, FL, MA) , and abs_cases
in the data frame. I am ignoring the population changes in those 2 years in the respective states.
I now want to calculate the relative cases for each state using the population for each state which I googled. (I will just use fantasy numbers here) pop<- "CA"= 11111, "NY"= 22222, "FL"= 33333,"MA"= 444444
.
I already tried using
...ANSWER
Answered 2021-Jun-15 at 14:40Without an example dataset, here is my guess at what you are trying to do. You can convert pop
into a dataframe using enframe
and join it to df
by state
. Then, you can compute the cases per population by each State in each month.
QUESTION
Given the following dataframe,
is it possible to calculate the sum of col2
and the sum of col2 + col3
,
in a single aggregating function?
ANSWER
Answered 2021-Mar-06 at 15:18Let us try assign
the new column first
QUESTION
I want to go from this:
name pet 1 Rashida dog 2 Rashida cat 3 Jim dog 4 JIm dogto this:
name num_dogs num_cats 1 Jim 2 0 2 Rashida 1 1In R I would do
...ANSWER
Answered 2021-Jan-22 at 20:50There are lots of different ways to do this.
If you are filtering the value of a single column, then you can use the .agg with a custom lambda function.
QUESTION
Here I have a loop that looks for keys & values from a JSON List
Currently, the view of the KivyMD List is correct but I want to pass onto the correct key onto print instead of having the last key from JSON printed out.
...ANSWER
Answered 2021-Apr-27 at 17:51Jonas! I have solved it with this:
QUESTION
When i use summarize any() all my columns get a new name any_original name. I want to keep the original name or rename the any away
in Splunk used to do something like rename value(*) as * and that did the trick, in kql im not sure
...ANSWER
Answered 2021-Jun-14 at 04:11ORIGINAL ANSWER (May 2021)
You can supply your own column names, like this:
QUESTION
Why the following command is slow (5 mins)?
...ANSWER
Answered 2021-Jun-13 at 08:54a. you're correct that using .show table T extents where tags contains 'string' | ...
would be much more efficient
b. as mentioned in the documentation: https://docs.microsoft.com/en-us/azure/data-explorer/kusto/query/extenttagsfunction
Filtering on the value of
extent_tags()
performs best when one of the following string operators is used:has
,has_cs
,!has
,!has_cs
.
c. which method is more efficient , filtering on a datetime field if available or tags?
The former, especially when your filter is on a substring, and not on the full content of the tag. Tags are a non-indexed metadata property of shards, and isn't an indexed data column. Also see: https://yonileibowitz.github.io/blog-posts/datetime-columns.html
QUESTION
ANSWER
Answered 2021-Jun-13 at 05:13You'll need to replace your original values in the Action column by the names you want to be displayed. The easiest way to do it is to use the case
function like this (look at the | extend Action = case(...)
part):
QUESTION
I have a dataset that identifies observations based on two variables: Time and Country. The variable of interest is dichotomous, and has the value 0 if the event didn't occur and 1 if it did. For some countries more than one observation is reported per year. The data can be summarized like this:
Country Time Conflict Bio Weapons A 2000 1 0 A 2000 2 0 B 2000 3 1 C 2000 4 0 D 2000 5 1 D 2000 6 0 D 2000 7 0 D 2000 8 1Is it possible two colapse these multiple observations into one observation per year and country with either outcome 0 (if the event never occured) or 1(if the event occured at least once)? Like this?:
Country Time Bio Weapons A 2000 0 B 2000 1 C 2000 0 D 2000 1Thank you in advance !
...ANSWER
Answered 2021-Jun-12 at 18:00Your output is a bit unlcear since it doesn't match with what your description is, but this is what I think you want:
QUESTION
ANSWER
Answered 2021-Jun-12 at 17:18Is this the output you're looking for?
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