Ive been searching the Stackoverflow but couldnt find the exact thread that could help me.
My problem is this, i want to be able to find and take out any occurances of 8 digits wihtin a string.
Dim SetOfMatches As MatchCollection
Dim MyRegex As New Regex("A^\d{8}$A")
Dim TestString As String = "testing 12345678 testing"
myMatches = myRegex.Matches(TestString)
For each Row as Match in myMatches
console.writeline(row.value)
Next
this doesnt not generate any hits. but i want to find the 8 digit occurance in the middle of the string.
I am very basic in RegEx.
any help would be great!
What are the A good for? I think you don't need them.
Try this
\d{8}
The ^ is an anchor for the start of the string and the $ for the end. So using those it will not find and digits within the string.
Regexr.com is a good online testing tool, you can see this regex here.
Another good source for regular expressions is regular-expressions.info
Related
I'm VERY new to using regular expressions, and I'm trying to figure something simple out.
I have a simple string, and i'm trying to pull out the 590111 and place it into another string.
HMax_590111-1_v8980.bin
So the new string would simply be...
590111
The part number will ALWAYS have 6 digits, and ALWAYS have a version and such. The part number might change location inside of the string.. so it needs to be able to work if it's like this..
590111-1_v8980_HMXAX.bin
What regex expression will do this? Currently, i'm using ^[0-9]* to find it if it's in the front of the file.
Try the following Regex:
Dim text As String = "590111-1_v8980_HMXAX.bin"
Dim pattern As String = "\d{6}"
'Instantiate the regular expression object.
Dim r As Regex = new Regex(pattern, RegexOptions.IgnoreCase)
'Match the regular expression pattern against a text string.
Dim m As Match = r.Match(text)
In Regex \d denotes numerics, so first you write \d.
Then as you know there will be a fix length of numbers which can be specified in Regex with "{}". If you specify \d{6} it means it will expect 6 continuous occurrences of a numeric character.
I would recommend to use this site to try your own expressions. Here you can also find a little bit of information about the expressions you are building if you hover over it.
Regex Tester
I have a very large text file that has multiple instances of "CLM*[NUMBER I WANT]*". I have been able to use regex to mostly obtain this thanks to another user on this site, but the results I'm getting are displaying the CLM* portion, when I really just want the number. You can see the relevant code below.
Dim strClaimData As String = ""
Dim strClaimNumber As String = ClaimLoadedGetCLM(strClaimData)
Public Function ClaimLoadedGetCLM(ByVal ediString As String) As String
Dim regex As New Regex("CLM\*(\d*?\*??\d*)")
Dim ClaimMatches As MatchCollection = regex.Matches(strClaimData)
For Each strClaimData As Match In ClaimMatches
lstClaimLoaded837Data.Items.Add(strClaimData.Value)
Next
End Function
I've tried a few things I've found online, such as appending a \K or \2, but I just get compile errors if I do that.
https://regex101.com/r/jH9eJ7/1
That shows what I want as "Match 1, Group 1", but I can't figure out how to get to it. I thought appending /1 would work, but that only returned CLM* with no number.
Any help would be greatly appreciated.
What you want to do is wrap the CLM\* part in a possitive lookbehind assertion:
(?<=CLM\*)
What this does asserts that (\d*\.?\d*) is preceded by CLM*, but doesn't include CLM* in the match.
https://regex101.com/r/jH9eJ7/3
You can tell it to use the captured group.
Replace:
strClaimData.Value
with:
strClaimData.Groups[1].Value
in your for loop.
I have this type of text:
string1_dog_bit_johny_bit_string2
string1_cat_bit_johny_bit_string2
string1_crocodile_bit_johny_bit_string2
string3_crocodile_bit_johny_bit_string4
string4_crocodile_bit_johny_bit_string5
I want to find all occurrences of “bit” that occur only between string1 and string2. How do I do this with regex?
I found the question Regex Match all characters between two strings, but the regex there matches the entire string between string1 and string2, whereas I want to match just parts of that string.
I am doing a global replacement in Notepad++. I just need regex, code will not work.
Thank you in advance.
Roman
If I understand correctly here a code to do what you want
var intput = new List<string>
{
"string1_dog_bit_johny_bit_string2",
"string1_cat_bit_johny_bit_string2",
"string1_crocodile_bit_johny_bit_string2",
"string3_crocodile_bit_johny_bit_string4",
"string4_crocodile_bit_johny_bit_string5"
};
Regex regex = new Regex(#"(?<bitGroup>bit)");
var allMatches = new List<string>();
foreach (var str in intput)
{
if (str.StartsWith("string1") && str.EndsWith("string2"))
{
var matchCollection = regex.Matches(str);
allMatches.AddRange(matchCollection.Cast<Match>().Select(match => match.Groups["bitGroup"].Value));
}
}
Console.WriteLine("All matches {0}", allMatches.Count);
This regex will do the job:
^string1_(?:.*(bit))+.*_string2$
^ means the start of the text (or line if you use the m option like so: /<regex>/m )
$ means the end of the text
. means any character
* means the previous character/expression is repeated 0 or more times
(?:<stuff>) means a non-capturing group (<stuff> won't be captured as a result of the matching)
You could use ^string1_(.*(bit).*)*_string2$ if you don't care about performance or don't have large/many strings to check. The outer parenthesis allow multiple occurences of "bit".
If you provide us with the language you want to use, we could give more specific solutions.
edit: As you added that you're trying a replacement in Notepad++ I propose the following:
Use (?<=string1_)(.*)bit(.*)(?=_string2) as regex and $1xyz$2 as replacement pattern (replace xyz with your string). Then perform an "replace all" operation until N++ doesn't find any more matches. The problem here is that this regex will only match 1 bit per line per iteration - and therefore needs to be applied repeatedly.
Btw. even if a regexp matches the whole line, you can still only replace parts of it using capturing groups.
You can use the regex:
(?:string1|\G)(?:(?!string2).)*?\Kbit
regex101 demo. Tried it on notepad++ as well and it's working.
There're description in the demo site, but if you want more explanations, let me know and I'll elaborate!
I am trying to use a regex in VB.NET - the language probably shouldn't matter though - I am trying to extract something reasonable out of a very large file name, "\\path\path\path.path.path\path\some_more_stuff_from a name.item_123_456.html"
I would like to extract, from that whole mess, the "item_123_456"
It seems to make sense that I can get everything before a pattern like ".html" , and from it, everything after the last dot ?
I have tried to get at least the last part (the entire string before .html) and I still get no matches:
Dim matches As MatchCollection
Dim regexStuff As New Regex(".*\\.html")
matches = regexStuff.Matches(strINeed)
Dim successfulMatch As Match
For Each successfulMatch In matches
strFound = successfulMatch.Value
Next
The match I experimented with, hoping I might even get everything between a dot and an .html: Regex("\\..*\\.html") returned Nothing as well.
I just can't get regular expressions to work...
.*\.(.*?)\.html
This finds as many characters as possible .* until it comes to ( a dot followed by as few characters as possible followed by a dot html ) (\.(.*?)\.html)
It places the stuff between the dot html and the dot preceding the dot html into a capturing group, which should be in $1. If you need the vb.net code for that I can likely get that as well, but your code looked okay
Your vb code should look something like this:
Dim matches As MatchCollection
Dim regexStuff As New Regex(".*\.(.*?)\.html")
matches = regexStuff.Matches(strINeed)
strFound = matches.Item(0).Groups(1).Value.ToString
It could probably be generalized into this
[^.\\]+\.html
Edit: or, initial dot required
\.[^.\\]+\.html
I have to extract all there is between this caracters:
<a href="/url?q=(text to extract whatever it is)&
I tried this pattern, but it's not working for me:
/(?<=url\?q=).*?(?=&)/
I'm programming in Vb.net, this is the code, but I think that the problem is that the pattern is wrong:
Dim matches As MatchCollection
matches = regex.Matches(TextBox1.Text)
For Each Match As Match In matches
listbox1.items.add(Match.Value)
Next
Could you help me please?
Your regex is seemed to be correct except the slash(/) in the beginning and ending of expression, remove it:
Dim regex = New Regex("(?<=url\?q=).*?(?=&)")
and it should work.
Some utilities and most languages use / (forward slash) to start and end (de-limit or contain) the search expression others may use single quotes. With System.Text.RegularExpressions.Regex you don't need it.
This regex code below will extract all urls from your text (or any other):
(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,#?^=%&:/~\+#]*[\w\-\#?^=%&/~\+#])?