Masking and Adding Expression to Parameter Components

Replies to This Discussion

Permalink Reply by David Rutten on October 1, 2010 at 2:43pm

Here's a few examples. Question marks can be used to match a single digit, asterisks can be used to match any number of digits.

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by Steve Lewis on October 1, 2010 at 3:28pm

Thanks David, I presume the same syntax applies to the point parameter component? It would be nice if we can add lrange constructors in the mask. For example filter points with X <= 10.

Permalink Reply by David Rutten on October 1, 2010 at 3:42pm

If you want ranges, use square brackets with hyphen separated extremes:

{0;0;[0-10];0}

If you want a custom set, use square brackets with comma separated indices:

{0;0;[0,2,4,6];0}

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by David Rutten on October 1, 2010 at 3:47pm

And you can use exclamation marks in front of elements to invert the mask. Thus:

{0;0;!7;0}

means anything but 7 in the third index. And:

{0;0;![0;1;9];0}

means anything but zero, one or nine in the third index. And:

{0;0;![3-8];0}

means anything outside of the 3-8 range in the third index.

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by Astro/Naught on October 1, 2010 at 5:21pm

Is a Grasshopper Primer update in the pipeline to explain & include examples for this?

Permalink Reply by David Rutten on October 2, 2010 at 7:40am

Hi Astro,

not from me. My plan is to vastly improve the Component help file system.

I'd like to have a flexible system where any object running inside Grasshopper can register any number of Helpfile pages, pages can have links to other pages, help file topics can contain images and example files etc. etc.

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by robert cervellione on October 1, 2010 at 6:54pm

are you using regex ? and would most of the regex rules work

Permalink Reply by David Rutten on October 2, 2010 at 7:44am

No. I wrote my own interpreter.

To be blunt, I don't understand RegEx. Never have, and I suspect I never will. Every time I try to learn how it works I'm just baffled by the utter unreadability of the example patterns. Like this one:

^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$

If there are features you'd like to see implemented in the Path Mask interpreter, let me know. If you want a regex component, I'll try and write one.

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by robert cervellione on October 2, 2010 at 10:06am

i hear you, it is a little like hieroglyphics but the simple rules are simple like

\d = find all numbers
\D = find anything but numbers
[0-5] = find a range

and so on

anyway this page helps me out

http://www.zytrax.com/tech/web/regex.htm

Permalink Reply by David Rutten on October 2, 2010 at 11:03am

One of the things which I found very difficult with regex (indeed, it may well be impossible for all I know) is to use multi-character digits as integers.

It's easy enough to match numbers between 0 and 4, but how does one match a string number between 32 and 99?

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by Steve Lewis on February 7, 2011 at 1:02pm

David

Maskign doenst appear to work if we use real numbers instead of integers in the mask construct

Permalink Reply by William Carroll on June 14, 2015 at 2:51pm

It's easy enough to match numbers between 0 and 4, but how does one match a string number between 32 and 99?

I am sure that your question was merely rhetorical, so I hope that my response isn't irritating. Here's a regex that answers this question though.

^(3[2-9])|([4-9][0-9])$

I say this hoping that you'll appreciate knowing that regexes can handle ranges such as this and can add really interesting functionality for number manipulation. I should add that it does certainly get trickier with larger numbers (e.g. 3-digits or more). I also know that this post is 5 years old, so I presume you may be aware of this by now... Anyways, thought it wouldn't hurt.

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