Find and edit specific line in text file?

[qweewq11]

Hello I want to read a text file that could look in some different ways since the user choose file from a list. I then want to igonre all the lines that begin with a special character, for example %. I then want to find all the lines "words" that begin with TRY for example and put those "words" in a string or array. If there is one line that contains TRY100 and anoter line that contains TRY200 I want to find those words and display them. How do i do this?

[nyc_(is_out_of_here)]

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@qweewq11 wrote:

Hello I want to read a text file that could look in some different ways since the user choose file from a list. I then want to igonre all the lines that begin with a special character, for example %. I then want to find all the lines "words" that begin with TRY for example and put those "words" in a string or array. If there is one line that contains TRY100 and anoter line that contains TRY200 I want to find those words and display them. How do i do this?

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Instead of expecting someone to provide you with a VI, you need to demonstrate that you have attempted to do this.

Post your VI.

[qweewq11]

But who said i want someone to provide me with a VI? I don't even want a VI since I can't open it on my computer, I want someone to give me tips and tell me if there is a good way to do this and then I can do it my self. I can't really find any functions that can do what I want and I can't find any good solution to my problem.

[crossrulz]

First you read the entire file.  Use the Read Text File.  Right-click on it and select the option to Read Lines.  The the count to read to -1 (read all).  You will now have an array of strings, one item for each line of your file.

Now you need to play the filter game.  I recommend using FOR loops with Autoindexing tunnels.  Assuming you are using 2012 or later, have the output autoindexing tunnels use the conditional tunnel.

Give this a try and see where you can go.  Post back with what you have tried and tell us where you are stuck.

[JÞB]

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@qweewq11 wrote:

But who said i want someone to provide me with a VI? I don't even want a VI since I can't open it on my computer, I want someone to give me tips and tell me if there is a good way to do this and then I can do it my self. I can't really find any functions that can do what I want and I can't find any good solution to my problem.

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HOLD it your are posting on the NI discussion forums LabVIEW board and you "cannot open a vi?"

However, you can learn more here by mistake than most places.

Have you ever heard of a Regex or, "Regular expression?"  Just click the blue text... It will take you someplace nice..

[nyc_(is_out_of_here)]

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@qweewq11 wrote:

But who said i want someone to provide me with a VI? I don't even want a VI since I can't open it on my computer, I want someone to give me tips and tell me if there is a good way to do this and then I can do it my self. I can't really find any functions that can do what I want and I can't find any good solution to my problem.

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You can't find any good solution?

How about looking at the Examples that ship with LabVIEW?

Or reading a tutorial or two?

[cedhoc]

Hi qweewq11,

Saying that you don't want a VI is quite confusing here. Are you looking for a LabVIEW solution or a non-LabVIEW solution ?

If you want to go with LabVIEW, just follow the recommandations of crossrulz and you should go in the right direction.

If you are looking for a non-LabVIEW solution, there are languages more suited for text processing, like Perl. But then you are not on the right forum 😉

In any case, the keyword here will be the regular expression, just as Jeff suggested above ! For LabVIEW, be sure to check the "Match Regular Expression" function. 

Kind regards,

[qweewq11]

Thanks I solved it buy using Match Pattern i a for loop and then put all my words in an array. In the array i removed all the blank elemets that are in between. My problem now is if a line starts with for example % i want to remove that line. So if i have an 1d array with the lines %abc, bcd, %cde and def i want to remove the lines with %abc and %cde and keep bcd and def. Any idea of how i coluld make that possible. I have tried to find a solution for hours.

[crossrulz]

What version of LabVIEW are you using?  If using 2012 or newer, you can use Conditional tunnels on a FOR loop.  So you autoindex your array of strings into the FOR loop.  Use String Subset to just look at the first character and check that it is not a "%".  So you will autodindex out of your FOR loop the original string, except that you have the conditional on it.  Use the output of the Not Equal as your condition.

[qweewq11]

No i use older versions than 2012 unfortunately...