read only number from string and number

[stevevantran]

I have "COM4" from my I/O.  how could to read number 4 only?

  Thank you

[smercurio_fc]

There are many ways to do this. The string palette has several string search functions, such as Match Pattern. The LabVIEW Help for this function explains how to use it to find various things, such as just numbers. Hint: Look at the "A sequence of one or more digits" line.

[falkpl]

scan from string COM%d but there are many ways depending on the string assumptions (regular expressions, string parsing, match string) ....

[stevevantran]

On the I/O I selected "COM4" but I only want to see only number 4 on indicator, please give me more help detail.

  Thanks

[Hornless.Rhino]

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falkpl wrote:
scan from string COM%d but there are many ways depending on the string assumptions (regular expressions, string parsing, match string) ....

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I think a regex pattern of [1-9]+ should work in this case.

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stevevantran wrote:

On the I/O I selected "COM4" but I only want to see only number 4 on indicator, please give me more help detail.

  Thanks

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What kind of indicator?

[Guruthilak · Accepted solution]

Like the attached image you can try it in "n" number of ways

[GovBob]

How about using the resources you already have? Try this. Open LabVIEW>>Click Help>>Find Examples>>Select the search tab and type in "strings" and you should find "Extract numbers.vi"

Hope this helps

[edwardanthony]

Hello, i might need your help regarding this matter.

I'm current taking a reading from Arduino from 2 accerolmeter to Labview. X=0.02 Y=-0.03 Z=0.99 A=0.33 B=0.42 C=0.84 (Example) 

But when i display them using Waveform Chart in labview, I need to use the array to count the position of the String from buffer which sometimes might be inaccurate due to the the value extracted.

I was told that i can use Search string from the beginning to allow the waveform to take in only the numeric. 

Are you able to assist me regarding this issue?

Below attached are the pictures..

[jcarmody]

[Hooovahh]

I realize a new question was asked, and jcarmody did a great job of answering it.  But I remember seeing a regular expression which pulls out a number from a string, and I've used it to turn a text file into a 2D array of numbers by splitting and processing each row.  It isn't as fast, but it is more robust because it works with any number in a string decimal or not, and the format of the string isn't needed for the processing.

http://forums.ni.com/t5/LabVIEW/regex-find-number-at-end-of-string/m-p/2511362#M764254

The regular expression is this.

(\d+(\.\d+)?)(?!.*\d+(\.\d+)?)