I hope I'm able to ask my question as simple as possible. I am very new to working with PowerShell.
Now to my question:
I use Invoke-Sqlcmd to run a query, which puts Data in a variable, let's say $Data.
In this case I query for triggers in an SQL Database.
Then I kind of split the array to get more specific information:
$Data2 = $Data | Where {$_.table -like 'dbo.sportswear'}
$Data3 = $Data2 | Where {$_.event -match "Delete"}
So in the end I have a variable with these Indexes(?), I'm not sure if they are called indexes.
table
trigger_name
activation
event
type
status
definition
Now all I want is to check something in the definition.
So I create a $Data4 = $Data3.definition, so far so good.
But now I have a big text and I want only the content of 2-3 specific rows.
When I used like $Data4[1] or $Data4[1..100], I realized that PowerShell sees every char as a line/row.
But when I just write $Data4 it shows me the content nice formatted with paragraphs, new lines and so on.
Has anyone an idea how I can get specific rows or lines of my variable?
Thank you all :)
It appears $Data4 is a formatted string. Since it is a single string, any indexed element lookups return single characters (of type System.Char). If you want indexes to return longer substrings, you will need to split your string into multiple strings somehow or come up with a more sophisticated search mechanism.
If we assume the rows you are after are actual lines separated by line feed and/or carriage return, you can just split on those newline characters and use indexes to access your lines:
# Array indexing starts at 0 for line 1. So [1] is line 2.
# Outputs lines 2,3,4
($Data4 -split '\r?\n')[1..3]
# Outputs lines 2,7,20
($Data4 -split '\r?\n')[1,6,19]
-split uses regex to match characters and perform a string split on all matches. It results in an array of substrings. \r matches a carriage return. \n matches a line feed. ? matches 0 or one character, which is needed in case there are no carriage returns preceding your line feeds.
Related
Lets say I have a database with about 50k entries in a column called content.
This column contains strings which causes problems to my further work.
Now here is the thing I need to do it for all the rows inside of that table.
Any Ideas?
Here an example:
'user wrote:
-----------------------------------------------------
> Some text
> that vary too much and I dont need it actually
> here is end of the text
The text I actually need.'
I would like to remove all of the unnecessary part so the only thing that is left is in this case :
'The text I actually need.'
This should delete all lines that start with a >:
regexp_replace(textcol, E'^>.*\n', '', 'gn');
The g flag is needed to delete all such lines, and the n flag makes the ^ match the position right after each line break.
I use an “extended” string literal (the leading E) so that I can write a newline as \n.
All.
I am used to programming VBA in Excel, but am new to the structures in Word.
I am working through a library of text files to update them. Many of them are either OCR documents, or were manually entered.
Each has a recurring pattern, the most common of which is unnecessary carriage returns.
For example, I am looking at several text files where there is a double return after each line. A search and replace of all double carriage returns removes all paragraph distinctions.
However, each line is approximately 30 characters long, and if I manually perform the following logic, it gives me a functional document.
If there is a double carriage return after 30+ characters, I replace them with a space.
If there were less than 30 characters prior to the double return, I replace them with a single return.
Can anyone help me with some rudimentary code that would help me get started on that? I could then modify it for each "pattern" of text documents I have.
e.g.
In this case, there are more than
thirty characters per line. And I
will keep going to illustrate this
example.
This would be a new paragraph, and
would be separated by another of
the single returns.
I want code that would return:
In this case, there are more than thirty character returns. And I will keep going to illustrate this example.
This would be a new paragraph, and would be separated by another of the single returns.
Let me know if anyone can throw something out that I can play with!
You can do this without code (which RegEx requires), simply using Word's own wildcard Find/Replace tools, where:
Find = ([!^13]{30,})[^13]{1,}
Replace = \1^32
and, to clean up the residual multi-paragraph breaks:
Find = [^13]{2,}
Replace = ^p
You could, of course, record the above as a macro...
Here is a RegEx that might work for you:
(\n\n)(?<!\.(\n\n))
The substitution is just a plain space, you can try it out (and modify / tweak it) here: https://regex101.com/r/zG9GPw/4
This 'pattern' tells the RegEx engine to look for the newline character \n which occurs x2 like this \n\n (worth noting this is from your question and might be different in your files, e.g. could be \r\n) and it assumes that a valid line break will be proceeded by a full stop: \..
In RegEx the full stop symbol is a single character wild card so it needs to be escaped with the '\' (n and r are normal characters, escaping them tells the RegEx engine they represent newline and return characters).
So... the expression is looking for a group of x2 newline characters but then uses a negative look-behind to exclude any matches where the previous character was a full stop.
Anyway, it's all explained on the site:
Here is how you could do a RegEx find and replace using NotePad++ (I'm not sure if it comes with RegEx or if a plugin is needed, either way it is easy). But you can set a location, filters (to target specific file types), and other options (such as search in sub-directories).
Other than that, as #MacroPod pointed out you could also do this with MS Word, document by document, not using any code :)
I'm trying to use VHDL to read from a file that can have different formats. I know you're supposed to use the following two lines of code to read a line at a time, the read individual elements in that line.
readline(file, aline);
read(aline, element);
However my question is what will read(aline, element) return into element? What will it return if the line is empty? What will it return if I've used it let's say 5 times and my line only has 4 characters?
The reason I want to know is that if I am reading a file with an arbitrary number of spaces between valid data, how do I parse this valid data?
The file contains ASCII characters separated by arbitrary amounts of white space (any number of spaces, tabs, or new lines). If the line starts with a # that line is a comment and should be ignored.
Outside of these comments, the first part of the file contains characters that are only letters or numbers in combinations of variable size. In other words this:
123 ABC 12ABB3
However, the majority of the file (after a certain number of read words) will be purely numbers of arbitrary length, separated by an arbitrary amount of white space. In other words, the second part of the file is this:
255 0 2245 625 430
2222 33 111111
and I must be able to parse these numbers (and interpret them as such) individually.
As mentioned in the comments, all the read procedures in std.textio and ieee.std_logic_textio skip over leading spaces apart from the character and string versions (because a space is as much a character as any other).
You can test whether a line variable (the buffer) is empty like this:
if L'length > 0 then
where L is your line variable. There is also a set of overloaded read procedures with an extra status output:
procedure read (L : inout LINE;
VALUE: out <type> ;
GOOD : out BOOLEAN);
The extra output - GOOD - is true if the read was successful and false if it wasn't. The advantage of these if that the read is unsuccessful, the simulation does not stop (as it does with the regular procedures). Also, with the versions in std.textio, if the read is unsuccessful, the read is non-destructive (ie whatever you were trying to read remains in the buffer). This is not the case with the versions in ieee.std_logic_textio, however.
If you really do not know what format you are trying to read, you could read the entire line into a string, like this:
variable S : string(1 to <some big number>);
...
readline(F, L);
assert L'length < S'length; -- make sure S is big enough
S := (others => ' '); -- make sure that the previous line is overwritten
if L'length > 0 then
read(L, S(1 to L'length);
end if;
The line L is now in the string S. You can then write some code to parse it. You may find the type attribute 'value useful. This converts a string to some type, eg
variable I : integer;
...
I := integer'value(S(12 to 14));
would set integer I to the value contained in elements 12 to 14 of string S.
Another approach, as suggested by user1155120 below, is to peek at the values in the buffer, eg
if L'length > 0 then -- check that the L isn't empty, otherwise the next line blows up
if L.all(1) = '#' then
-- the first character of the line is a '#' so the line must be a comment
I'm trying to assign the value of a column from the query to a variable using cfset tag. For example, if the value is 'abcd#1244', then if I use <cfset a = #trim(queryname.column)#> it will return only abcd. But I need the whole value of that column.
You will need to escape the # symbol. You can get clever and do it all in one swoop (# acts as an escape character when placed next to another #).
Example being
The item## is #variable#.
In order to print "The item# is 254."
There are plenty of text and string functions at your disposal.
I'd recommend first trying to escape the value as soon as it is drawn from your database.
http://help.adobe.com/en_US/ColdFusion/9.0/CFMLRef/WSc3ff6d0ea77859461172e0811cbec1a60c-7ffc.html
I'm making a fully working add and subtract program as a nice little easy project. One thing I would love to know is if there is a way to restrict input to certain characters (such as 1 and 0 for the binary inputs and A and B for the add or subtract inputs). I could always replace all characters that aren't these with empty strings to get rid of them, but doing something like this is quite tedious.
Here is some simple code to filter out the specified characters from a user's input:
local filter = "10abAB"
local input = io.read()
input = input:gsub("[^" .. filter .. "]", "")
The filter variable is just set to whatever characters you want to be allowed in the user's input. As an example, if you want to allow c, add c: local filter = "10abcABC".
Although I assume that you get input from io.read(), it is possible that you get it from somewhere else, so you can just replace io.read() with whatever you need there.
The third line of code in my example is what actually filters out the text. It uses string:gsub to do this, meaning that it could also be written like this:
input = string.gsub(input, "[^" .. filter .. "]", "").
The benefit of writing it like this is that it's clear that input is meant to be a string.
The gsub pattern is [^10abAB], which means that any characters that aren't part of that pattern will be filtered out, due to the ^ before them and the replacement pattern, which is the empty string that is the last argument in the method call.
Bonus super-short one-liner that you probably shouldn't use:
local input = io.read():gsub("[^10abAB]", "")