I want to create a collection of Windows Services that will match a regular expression using a Where clause.
For example, I have 3 Windows Services called:
RCLoad1
RCLoad2
RCLoad3
my Regex would be something like: "^RCLoad*"
I'd like to use something like:
ServiceController[] myServices = ServiceController.GetServices(ServerName)
.Where Regex.IsMatch(....)
But I can't get it to work.
You are not clear on the exact failure.
Does GetServices(ServerName) actually return a list of items?
Subsequently you don't mention what property has the name of the server, Is it Name? Because the code you have now takes the objects ToString() which most likely defaults to the type name and hence the failure. (?)
Find the right name property and use the pattern RCLoad, which will find it anywhere in the string, and then put into a ToList() such as
Regex rgx = new Regex(#"RCLoad"); // RCLoad can be anywhere in the string.
var controllers = ServiceController.GetServices(ServerName)
.Where(sc => rgx.IsMatch( sc.Name ))
.ToList();
Related
I'm using the Microsoft.Azure.Search SDK to run an Azure Cognitive Services search that includes synonym expansion. My SynonymMap is as follows:
private async Task UploadSynonyms()
{
var synonymMap = new SynonymMap()
{
Name = "desc-synonymmap",
Synonyms = "\"dog\", \"cat\", \"rabbit\"\n "
};
await m_SearchServiceClient.SynonymMaps.CreateOrUpdateAsync(synonymMap);
}
This is mapped to Animal.Name as follows:
index.Fields.First(f => f.Name == nameof(Animal.Name)).SynonymMaps = new[] { "desc-synonymmap" };
I am trying to use both fuzzy matching and synonym matching, so that, for example:
If I search for 'dog' it returns any Animal with a Name of 'dog', 'cat' or 'rabbit'
If I search for 'dob' it fuzzy matches to 'dog' and returns any Animal with a Name of 'dog', 'cat' or 'rabbit', as they are all synonyms for 'dog'
My search method is as follows:
private async Task RunSearch()
{
var parameters = new SearchParameters
{
SearchFields = new[] { nameof(Animal.Name) },
QueryType = QueryType.Full
};
var results = await m_IndexClientForQueries.Documents.SearchAsync<Animal>("dog OR dog~", parameters);
}
When I search for 'dog' it correctly returns any result with dog/cat/rabbit as it's Name. But when I search for 'dob' it only returns any matches for 'dog', and not any synonyms.
This answer from January 2019 states that "Synonym expansions do not apply to wildcard search terms; prefix, fuzzy, and regex terms aren't expanded." but this answer was posted over a year ago and things may have changed since then.
Is it possible to both fuzzy match and then match on synonyms in Azure Cognitive Search, or is there any workaround to achieve this?
#spaceplane
Synonym expansions do not apply to wildcard search terms; prefix, fuzzy, and regex terms aren't expanded
Unfortunately, this still holds true. Reference : https://learn.microsoft.com/en-us/azure/search/search-synonyms
The reason being the words/graphs that were obtained are directly passed to the index (as per this doc).
Having said that, I m thinking of two possible options that I may meet your requirement :
Option 1
Have a local Fuzzy matcher. Where you can get the possible matching words for a typed word.
Sharing a reference that I found: Link 1. I did come across a lot of packages which did the similar tasks.
Now from your obtained words you can build OR query binding all the matching words and issue it to the Azure cognitive Search.
So for an instance : When dob~ is fired - assuming "dot,dog" would be the words generated by the Fuzzy logic code.
We take these two words and subsequently issue "dog or dot" query to the Azure. Synonyms will be in turn effective because of the search term "dog "and the results will be retrieved accordingly based on the synonymmap.
Option 2
You could consider to handle using a synonym map. For example, mapping "dog" to "dob, dgo, dot" along with other synonyms.
I am currently passing a parameter to a SQL string like this -
grid=0&
And I am using a RegEx to get the 0 value like so-
Match match = Regex.Match(input, #"grid=([A-Za-z0-9\-]+)\&$",
RegexOptions.IgnoreCase);
string grid = match.Groups[1].Value;
which works perfectly.
However as development has progressed it is clear that more parameters will be added to the string like so-
grid=0&hr=3&tb=0
These parameters may come in a different order in the string each time so clearly the RegEx I am currently using wont work. I have looked into it and think Split may be an option however not sure.
What would the best method be and how could I apply it to my current problem?
If you're parsing query string and looking for an alternative to Regex, there is a specialized class and method for that, it returns collection of parameters:
string s = "http://www.something.com?grid=0&hr=3&tb=0";
Uri uri = new Uri(s);
var result = HttpUtility.ParseQueryString(uri.Query);
You have to include System.Web namespace.
You can access each of the parameters' values by using it's key:
foreach (string key in result.Keys)
{
string value = result[key];
// action...
}
Regexes can still be used here. Consider adding another capture group to capture the property name, and then looping over all of the results using Matches rather that Match, or calling Match multiple times.
I need to somehow detect if there is a parent OU value, and if there is retrieve it.
For example, here there is no parent:
LDAP://servera/OU=Santa Cruz,DC=contoso,DC=com
But here, there is a parent:
LDAP://servera/OU=Ventas,OU=Santa Cruz,DC=contoso,DC=com
So I would need to retrieve that "Ventas" string.
Another example:
LDAP://servera/OU=Contabilidad,OU=Ventas,OU=Santa Cruz,DC=contoso,DC=com
I would need to retrieve that "Ventas" string as well.
Any suggestions on how to tackle this?
string ldap = "LDAP://servera/OU=Ventas,OU=Santa Cruz,DC=contoso,DC=com";
Match match = Regex.Match(ldap, #"LDAP://\w+/OU=(?<toplevelou>\w+?),OU=");
if(match.Success)
{
Console.WriteLine(match.Result("${toplevelou}"));
}
I'd find the first occurrence of OU=... and get it's value. Then I'd check if there was another occurrence after it. If so, return the value I've got. If not, return whatever it is you want if there's no parent (String.Empty, or, null, or whatever).
You could also use a regular express like this:
var regex = new Regex(#"OU=(.*?),");
var matches = regex.Matches(ldapString);
Then check how many matches there are. If >1 return the captured value from the first match.
Update
The regex above needs to be improved to allow the case where there's an escaped comma (\,) in the LDAP string. Maybe something like:
var regex = new Regex(#"OU=((.*?(\\\,)+?)+?),");
That may be broken, and there may be simpler way to do the same thing. I'm not a regex wizard.
Another Update
Per Kimberly's comment below the regex should be #"OU=((?:.*?(?:\\\,)*?)+?),".
Call me crazy, but I 'd do it this way (hey ma, look, an one-liner!):
var str = "LDAP://servera/OU=Ventas,OU=Santa Cruz,DC=contoso,DC=com";
var result = str.Substring(str.LastIndexOf('/') + 1).Split(',')
.Select(s => s.Split('='))
.Where(a => a[0] == "OU")
.Select(a => a[1])
.Reverse().Skip(1).FirstOrDefault();
result is either null or has the string you want. This will work no matter how many OUs are in there and return the second-to-last one, as long as the format of the string is valid to begin with.
Update: possible improvements:
The above will not work correctly if your DN contains an escaped forward slash or an escaped comma.
To fix both of these you need to use regular expressions. Change:
str.Substring(str.LastIndexOf('/') + 1).Split(',')
to:
Regex.Split(Regex.Split(str, "(?<!\\\\)/").Last(), "(?<!\\\\),")
What this does is separate the DN by getting the last part of str after splitting on forward slashes, and split the in parts DN by splitting on commas. In both cases, negative lookbehind is used to make sure that the slashes/commas are not escaped.
Not as pretty, I know. But it's still an one-liner (yay!) and it still allows you to use LINQ further down to handle multiple OUs any way you choose to.
So, Im trying to make a program to rename some files. For the most part, I want them to look like this,
[Testing]StupidName - 2[720p].mkv
But, I would like to be able to change the format, if so desired. If I use MatchEvaluators, you would have to recompile every time. Thats why I don't want to use the MatchEvaluator.
The problem I have is that I don't know how, or if its possible, to tell Replace that if a group was found, include this string. The only syntax for this I have ever seen was something like (?<group>:data), but I can't get this to work. Well if anyone has an idea, im all for it.
EDIT:
Current Capture Regexes =
^(\[(?<FanSub>[^\]\)\}]+)\])?[. _]*(?<SeriesTitle>[\w. ]*?)[. _]*\-[. _]*(?<EpisodeNumber>\d+)[. _]*(\-[. _]*(?<EpisodeName>[\w. ]*?)[. _]*)?([\[\(\{](?<MiscInfo>[^\]\)\}]*)[\]\)\}][. _]*)*[\w. ]*(?<Extension>\.[a-zA-Z]+)$
^(?<SeriesTitle>[\w. ]*?)[. _]*[Ss](?<SeasonNumber>\d+)[Ee](?<EpisodeNumber>\d+).*?(?<Extension>\.[a-zA-Z]+)$
^(?<SeriesTitle>[\w. ]*?)[. _]*(?<SeasonNumber>\d)(?<EpisodeNumber>\d{2}).*?(?<Extension>\.[a-zA-Z]+)$
Current Replace Regex = [${FanSub}]${SeriesTitle} - ${EpisodeNumber} [${MiscInfo}]${Extension}
Using Regex.Replace, the file TestFile 101.mkv, I get []TestFile - 1[].mkv. What I want to do is make it so that [] is only included if the group FanSub or MiscInfo was found.
I can solve this with a MatchEvaluator because I actually get to compile a function. But this would not be a easy solution for users of the program. The only other idea I have to solve this is to actually make my own Regex.Replace function that accepts special syntax.
It sounds like you want to be able to specify an arbitrary format dynamically rather than hard-code it into your code.
Perhaps one solution is to break your filename parts into specific groups then pass in a replacement pattern that takes advantage of those group names. This would give you the ability to pass in different replacement patterns which return the desired filename structure using the Regex.Replace method.
Since you didn't explain the categories of your filename I came up with some random groups to demonstrate. Here's a quick example:
string input = "Testing StupidName Number2 720p.mkv";
string pattern = #"^(?<Category>\w+)\s+(?<Name>.+?)\s+Number(?<Number>\d+)\s+(?<Resolution>\d+p)(?<Extension>\.mkv)$";
string[] replacePatterns =
{
"[${Category}]${Name} - ${Number}[${Resolution}]${Extension}",
"${Category} - ${Name} - ${Number} - ${Resolution}${Extension}",
"(${Number}) - [${Resolution}] ${Name} [${Category}]${Extension}"
};
foreach (string replacePattern in replacePatterns)
{
Console.WriteLine(Regex.Replace(input, pattern, replacePattern));
}
As shown in the sample, named groups in the pattern, specified as (?<Name>pattern), are referred to in the replacement pattern by ${Name}.
With this approach you would need to know the group names beforehand and pass these in to rearrange the pattern as needed.
I need to find « in a string with a regex. How would you add that into the following:
String RegExPattern = #"^[0-9a-df-su-z]+\.\s«";
Regex PatternRegex = new Regex(RegExPattern);
return (PatternRegex.Match(Source).Value);
You should be able to simply use it directly:
var pattern = new Regex("«");
Of course, if used alone you can also use String.IndexOf instead. If you want to use it in another pattern, as in your question, go ahead. The usage is correct.
If, on the other hand, you also want to allow the named entity, use an alternation:
var pattern = new Regex("(?:«|«)");
Once again, the same can be done in a more complex expression. The ?: at the beginning of the group isn’t necessary; it just prevents that a capture group will be created for this alternation.