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How / Why can visual studio give suggestions / hints while making a Regex string?

First, a little context as to what I mean. I've recently started learning some basics of Regex and wanted to try it in .NET. In Visual Studio 2019, while working in C#, I can make a Regex object. I was astonished and amazed when I saw that Visual Studio is actually giving me hints as to the syntax of the "Regex language" (so to speak), which it will also color appropriately. Here is a picture of what I mean:
With that in mind, my questions is: Does this happen just because it is built-in to Visual Studio, to show this when editing this particular argument of Regex? Or, if not, how and where exactly is it stated how it should give hints for the string? Is it some sort of advanced <Summary> like tagging?
Can I, for example, implement something like that for my classes so that custom hints are given out when making strings in my classes' methods?

Actually, what you saw is all the Intellisense that VS provides for Regex expressions.
And Intellisense that VS itself provides to the Regex expression is limited. And those are all.
Besides, Intellisense is a built-in tool of VS and we cannot get an easy way to change the build-in tool of VS unless you write your own vs extension that extends the Intellisense.
As a suggestion, you can search on the VS Marketplace to search if anyone has published such extension.
I have found that Resharper extension(It is a paid extension but the new user can use 30 days for free) has a powerful feature for Regex expressions.
See this document. It provides the better Intellisense and also has the feature to verify the regular expression.
In addition, if these still do not meet your requirements and you want to add some custom features, I suggest you could suggest a feature about your ideas to the DC Forum.
Also, you can share the link here and anyone including us will vote it so that it will get more Microsoft's attention.

Suggestion Regarding Template Engines

I am looking for the template Engines that will cover the loops/lists and conditional(C#).
I searched regarding that and found a few like handlebars and fluids.
So, looking for the best template engines available also with some examples that how we can use that.
Please give your valuable suggestions waiting for your response.
TIA

ZedGraph Custom SymbolTypes

I am using C# to create a ZedGraph which uses custom symbols for the datapoints.
I see in older posts that there was, at one point, a "SymbolType.UserDefined" option, but this does not seem to be present in the latest version of ZedGraph (v5.0.9.41461).
http://zedgraph.sourceforge.net/documentation/html/T_ZedGraph_SymbolType.htm
I am hoping that there is a newer/better way to do this. If so, can someone please point me towards it?
If not, can someone recommend an alternative solution?
These symbols are industry standards for the application's market, so we have to comply.
Thank you for any assistance anyone can provide!

As it turns out, I found/installed version 5.1.5, and the UserDefined SymbolType option is available in there.
All versions...
https://sourceforge.net/projects/zedgraph/files/zedgraph%20dll%20only/

extracting nouns,noun phrases,adjectives verbs from text file corpus using visual c#

i am doing a project wherein i have to extract nouns adjectives noun phrases and verbs from text files(.doc) format.
i have a corpus of around 75 such files. i have accessed net to find about it and i came across POS tagging in python using nltk.
as my project is in c# (using visual studio 2008) i need a code to do so.
i have tried wordnet api for the same and even sharpnlp but as i am a newbie i found these tough to integrate with my project.
can anybody please suggest me simpler code to do so using something like vocabulary etc. plz help me guys.
thanx.

I worked in NLP (Natural Language Processing) for an industry leader for a while and what you want to do is no trivial task. I know one of the creators of nltk and I have used it myself; it's a high quality open source tool and I'd recommend you use it (do you have a particularly compelling reason to use C#?)
POS tagging is typically implemented by training a model of language on hand-annotated data, then applying that model to new text, predicting the parts of speech and giving a confidence . nltk has tools that do this, and they also have some models (if I'm not mistaken).
You'll find that most tools are written in C++, Java, and Python. If you don't know any of the languages look at this as an excellent opportunity to learn something!
See Wikipedia, especially the links at the bottom, for more information and other software available to use for such tagging.

Christopher is correct in his statement that NLP implementations are no picnic. However, I've recently looked into a viable solution using OpenNLP in a .NET project with a rudimentary PoS parser. In my example I am looking for noun phrases, but it shouldn't be too difficult a text to find other fragments as well. I find the OpenNLP Tools Models for 1.5 to be sufficient for my purposes.
I realize this answer is woefully late for the questioner, but hopefully it will give others some inspiration with this difficult field to get into.
Extracting noun phrases with contextual relevance in .NET using OpenNLP

Kindly read through this article.
Easy Integration of SharpNLP with C# Visual Studio Project
In this article, I have given a step by step way of integrating SharpNLP with C# project and have given sample code snippets for specifically address your issue such as Sentence Splitting, tokenizing and POSTagging.
Try this out and I will be able to help you with the problems you encounter.

C# Autolevel snippet?

Has anyone seen any good snippets for autoleveling an image in C#?

See http://code.google.com/p/aforge/

The source code for Paint.net might be a good place to rummage around for various examples of image processing with .NET. In fact, auto-level is a basic feature of Paint.NET, you just need to dig it out!