Word Count Using LabVIEW

[MHutch]

Overview
This example is a simple VI that performs a word count on a string by counting spaces between words.

 
Description
This VI uses the match pattern VI to search a string and count the number of spaces, effectively doing a wordcount.

 
Requirements

• LabVIEW 2013 (or compatible)

Steps to Implement or Execute Code

1. Enter text into string input
2. run code to obtain word count

Additional Information or References
VI Block Diagram

 **This document has been updated to meet the current required format for the NI Code Exchange.**

[Steve03]

Your vi doesn't account for a text string that may contain multiple space between words or words separated by tabs or other punctuation.

A better match pattern string would be "[A-Za-z-]+" which will count actual strings of characters as words including hyphenated words.

you could also then remove the +2 as the loop will run a final iteration where it doesn't find a word which will offset the 0 based iteration count.

[carolvieirav]

Hi, Steve

I'm beginner in labview and I did not understand what is "[A- Za- z -] +" can you explain bettter witch string I have to use for my counter disregard more than one space between words please

thanks,

Carol Vieira

[Steve03]

Carol,  The match pattern vi treats that as a search string for any combination of the uppercase A-Z and the lowercase a-z  and the hyphen character joined together. ie, a word.

The + after the brackets means it will match any number of those successive characters until it hits a character that's not part of that set.

It's not looking for spaces so any number of spaces would not count as a match and therefore be ignored. MHutch's example above counts spaces not words, but if you define a word as a string of alpha characters and perhaps hyphenated then the "[A-Za-z-]+" would search for "words". Perhaps an apostrophe character as well could added to the string within the brackets, but I doubt it would affect the word count.

[carolvieirav]

Thank you very much

[apis]

Hi Steve03,

Can you please explain more about how to use special characters in match pattern functions.

Appreciate if you can provide more & more examples for each special characters.

Thanks.

[Steve03]

apis,

Try this tutorial on regular expressions.

http://www.regular-expressions.info/quickstart.html

[apis]

Thank you Steve.

This really help.