I am new to regular expressions and I am trying to implement the metaphone algorithm in vb.net. [URL] The algorithm has lots of steps to replace characters depending on certain conditions. (ex. replace w unless followed by a vowel). Is there a way to handle branching logic using regular expressions?
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I am trying to extract a url from a html page that is located specifically between the <h2 </h2> header. For example the following header is in the html page;
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The following works in vb.net, and basically only allows characters on a standard US Keyboard. Any other character pasted gets deleted. I use the following regular expression code:
"[^A-Za-z0-9[{}]`~!@#$%^&*()_-+=\/:;'""<>,.|? ]", "")
I am just can't get my head around this.I've got this Regex:
(?<=Photo:)(.+?)(?=Stock)|(?<=Stock Code:)(.+?)(?=Make:)|(?<=Make:)(.+?)(?=Model:)|(?<=Model:)(.+?)(?=Year:)|(?<=Year:)(.+?)(?=Price:)|(?<=Price:)(.+?)(?=Description:)|(?<=Description:)(.+?)(?=Photo:)|(?<=Description:)(.+?)(?=Page:)
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Is there a way to escape all metacharacters in a string with the exception of "*"?
View 1 RepliesI need help extracting the value of a wildcard from a Regular Expressions match. For example:
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I want to use Regex.Replace to replace a Match with a context sensitive value. I use the MatchEvaluator for this. But to make things simpler lets say I'm matching %v I want %v to be escapable, so if I use \%v it will not match. Anything else should match.
The pattern I came up with is this: (?:[^\]|^)%v It basically matches %v if it occurs at the beginning of the string, or if it follows any character except . It doesn't capture the first part of the expression.I know this isn't the "right" way to do it. But it worked just fine until I noticed that when I use this pattern in a replace, it includes the character before %v in the replacement(duh, right?)So, if I have ThisIsAValue:%v and I do Regex.Replace, replacing with the string Value, my result will be ThisIsAValueValue instead of ThisIsAValue:ValueI've tried googling this but the fact that "escape character" is so heavy in RegEx, all the results are geared towards the USAGE of escape characters instead of picking them out with a pattern.
I'm having trouble parsing some text. Here's an example of the text:
201 BBQ 0.000 9.000 0.099 0.891 9.000 0.000 0.000 0.000
705 W 1 PC 0.000 135.000 0.295 39.825 0.000 0.000 135.000 0.000
2106 ONL 9.99 41.141 3.000 4.110 12.330 3.000 0.000 0.000 29.970
Here's the latest incarnation of the code I've been trying:
objInfo = System.Text.RegularExpressions.Regex.Split(
newLine,"(d{3,5})|([0-9]+[.]+[0-9]+)|(w*)")
I'm having trouble because I'm avoiding getting many blank spaces in the array after splitting. I'm trying to avoid using the optional | character but I get no results when I set it up without it!
I've spent much of the evening reviewing regular expressions and I've downloaded the following programs:
RegEx Designer.NET
Antix RegEx Tester
Expresso
I'm having trouble because the description contains a decimal point SOMETIMES and sometimes it doesn't. The description sometimes contains a whole number sometimes it doesn't.My friend recommended I use awk to divide it into columns. The thing is...I teach a Community Education class with Visual Basic .Net and I need to improve my RegEx skills.
Following on from a post I made earlier, I am making progress with what I require, but not knowing much about how RegEx expressions work, I'm stuck!
View 1 RepliesI need help from the Regex wizards out there. I am trying to write a simple parser that can tokenize the options list of a Snort rule (Snort, the IDS/IPS software). Problem is, I can't seem to find a workable formula that breaks apart the individual rule options based on their terminating semi-colon. The formulas that I have cooked up grab all options between parenthesis into a single capture group.
I am using the excellent RegExr tool at the GSkinner site with some of the below sample rule options from Emerging Threats (I parsed off the rule header -- that's easy to tokenize):
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I had to play with a few example regex's that work with quoted strings. Finally realized that I am staring at negative look-behinds that avoid quotes that are escaped. This seems to solve any other escaped character, too, because escaped characters only appear inside unescaped quotes.
i need a regular expressions string to get all anchor tags in a page with a specific css class name, in c#/vb.netthis is what i got so far"<a.*?href=""(.*?)"".*?>(.*?)</a>"ut my attempts to add "class=name" isnt working, also is it possible to find links where the class name appears either before or after the href with one expression
View 4 RepliesI'm trying to do is some password validation. It needs to have at least 1 lower case character, 1 uppercase character, 1 number and at least 6 characters in length. I figured I could do this using "RegularExpressions" however I can't figure out how to determine the "at least one occurance" of each. For example I thought the following would work but it only validates that what is input is a lower case, uppser case or numeric character, not that the input has at least one of each. The user should be able to enter any characters but at least one of lower case, upper case and numeric characters.
Dim
myMatch
As
Match
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I have a string list which has hundrens of elements. Now I want to find a rule to distinguish them according to their similarity. There are these kinds of pattern.
Group 1: "ABC 20", "ABC 20 Dup". There is a substring "DUP" in the last position.
Group 2: "saliva 4", "saliva 4_2","siliva 4_3", etc. There is a substring "_" plus a number in the last position.
Group 3: "sal_1", "sal_1b","sal_1c", etc. There is a character in the last popsition.
Group 4: "NA222", "NA222b", there is a character in the last position.
Group 5: "1","1_2","10","10_2" etc.
I want to put them into a dictionary if they are similar.
I have a number that always will be in this format
1815131217 Lets say I want to parse out all the 1's in between leaving only 85327
How can I do that?
What if my number is 1310111512
The number needs to be 30152 How can I do that?
I've read a fair number of articles and all tell me this is correct code. However, no matter how many e-mails I try, this always returns false:
vb
If Regex.IsMatch(txtbxFbUsername.Text, "^[A-Z0-9._%+-]+@[A-Z0-9.-]+.[A-Z]{2,4}$") = False Then
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Where is the regular expressions documentation?
View 4 RepliesI got this url for example [URL]..I want to get the last digit numbers and the rest could be anything.
I need a format like this [URL]..My knowledge is very poor in this regex thing so
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It has been a while since I have used regular expressions and I'm hoping what I'm trying to do is possible. I have a program that sends automated response regarding a particular file and I'd like to grab the text between two words I know will never change. In this example those words are "regarding" and "sent"
Dim subject As String = "Information regarding John Doe sent."
Dim name As String = Regex.IsMatch(subject, "")
So in this case I'd like to be able to get just "John Doe". Every regexp I'm coming up with includes the words "regarding" and "sent". How can I use those words as the boundaries but not include them in the match?
im trying to count syllabes using regular expressions. i have already counted words
Static word As New System.Text.RegularExpressions.Regex("[a-zA-Z]+s",
System.Text.RegularExpressions.RegexOptions.Compiled Or
System.Text.RegularExpressions.RegexOptions.Multiline)
how do i count syllables in each word i have counted. i can count syllables in whole tectbox but cant find a way to process each word i have counted separately.
How can I use backreference in replacing regular expressions.[code]But this replaces all the tags with the string [1] instead of the ones which were found.How can I achieve this using regular expressions?
View 4 RepliesImports System.Text.RegularExpressions
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim t As Object
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I'm trying to use regular expressions to find a matching model within the game. This part works perfectly! The only problem is that if it finds more than one match it'll try to place all matches it finds which I don't want it to do. Anyone more advanced in Regex can they tell me how to use regular expressions to only show one match or the first match it finds?
If Messege.ToLower.StartsWith("^place model") Then
Dim Regex As String = Messege.Remove(0, 13)
Dim R As New Regex(String.Format(".*{0}.*", Regex))
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I have a little program that reads some text from a textfile. But now I need to read the following line[url]...
And then get the name, surename, and email adres from this string using regular expressions.
But I don't know how to do this with regular expression. Can somebody give an example how I can retrieve the email adres, name, and surename from this string using regular expression?[code]...
I know which elements that I need to capture which are the everything between these two elements <a href="everything inside the quotes"What would the syntax for this look like in VB.NET using regular expressions? Also how can I input the results into a richtextbox?
View 1 RepliesI've tried to extract the URL from an html page using regular expressions. It is really hard to understand. I have an existing application and would like to alter the code to search for a url in the form src="[URL]" the problem is that ive tried to use different expressions to no avail. could someone look at this code and advise how to alter it do what I need it to do.
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I want to make sure using the custom expression validator that no ' or " can be used i tryed using [^"'] but whenever i put normal letters it doesnt work either.
View 1 RepliesWhat happens exactly when you use a regular expression? How do they parse a string so quickly?
View 2 RepliesI have the following lines showing up in files that have been converted to XML from an Excel worksheet:
<Worksheet ss:Name="Sheet1">
<Names>
<NamedRange ss:Name="Print_Area" ss:RefersTo="=Sheet1!R30C1:R8642C15"/>
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how do you extract multiple decimals with different number of decimal places from a string? I'm looking to find a generic way to extract 3 numbers out the following strings.
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Difference between Java & .Net Framework Regular Expressions Pattern I am trying to convert My .Net Framework but patterns are not valid?
e.g. How would we name the grouping constructs in java, etc.