Open Source Components in LabVIEW

Posted on Sunday 8 January 2006

When looking at the online help for the Match Regular Expression function, I noted the following copyright notice:

Match Regular Expression Details
Use regular expressions in this function to refine searches.

Certain regular expressions that use alternation (such as (.|\s)*) require significant resources to process when applied to large input strings. In some cases a stack overflow will occur and you will get an error dialog. If this occurs try to simplify your regular expression, or reduce the size of the string that you are parsing.

Copyright
Copyright 19972004 University of Cambridge. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
Neither the name of the University of Cambridge nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


So, it looks like NI is using the Pearl Compatible Regular Epression (PCRE) library.

Makes me wonder… why is there no copyright notice on the ZIP VIs which use the zlib and zip libraries. I guess that NI doesn’t have to put such notices for the zlib/zip libraries (based on the zlib and zip license terms, but it would be nice). I guess that’s just the way that NI likes to keep LabVIEW… don’t let anyone know what’s under the hood.


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