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I would like to remove all appearances of the character / and \ in a string if it appears consecutively more than twice, using Regex. This means, if a string contains abc////////////////////////def, I would like to get all / removed. However, it should not remove "the / in http://.
Could someone please suggest?
You can use /{3,}, which will match 3 or more occurrences of the / character.
var result = Regex.Replace("abc///def", "/{3,}", "");
Update: to reply to your comment, the * character is a metacharacter in regex, which holds a special meaning, so you need to escape it. Try this: \*{3,}. If you want to combine both characters, you can use a character class: [/*]{3,}. A character class is denoted by the square brackets. Inside a character class you don't need to escape metacharacters, which is why I simply list * inside without escaping it as I did earlier.
Use negative look-behind assertion:
#"(?<!https?:)/{2,}|\\{2,}"
For example:
Regex pattern = new Regex(#"(?<!https?:)/{2,}|\\{2,}");
Console.WriteLine(pattern.Replace(#"http://example.com", ""));
Console.WriteLine(pattern.Replace(#"abc//////////def", ""));
Console.WriteLine(pattern.Replace(#"abc\\\\\\\\\\def", ""));
prints
http://example.com
abcdef
abcdef
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Can anyone tell me which pattern should I use for following string Format:
First character always 'C' or 'c'
After that 1-4 numeric Digits
Then '_'
At last again series of some characters (no. not fixed)
eg: C10_COM, C1122_ABC etc.
In c# for Regex.IsMatch()
Try this:
^[cC][0-9]{1,4}_.*$
Where:
^ = Start of the line
[cC] = either upper or lowercase c
[0-9]{1,4] = Match a number 1 to 4 times
_ = underscore
.* = Any number of characters
$ = end of line
Addendum: You didn't specify if you were allowed to have zero characters at the end of the line. If not, then replace .* with ?*.
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Having codes in the following format [Alphanumeric][Letter][Alphanumeric][Alphanumeric] i.e A1AA
Now I also have a dictionary of all the 4 letter words I am trying to block i.e R2D2
What I am looking for is a regular expression to find the matches for each code and item in my dictionary but also 1 step further and to replace characters and letters which look alike i.e. i and 1, s and 5 and see if any matches happen there.
Anything like that out there
Let's say your dictionnary contains this codes:
R2D2
C3P0
X5ZZ
I would load the dictionnary and build on the fly a regex. The final regex would be:
(?-i)(R2D2|C3P0|X5ZZ)
Then apply this regex to each of your codes
If Regex.Matches(finalRegex) Then
// Evil code catched
Else
// Nice code found ...
End If
I'll give you a headstart
var matches = Regex.Matches(#"A1AA", #"([a-zA-Z0-9][a-zA-Z][a-zA-Z0-9][a-zA-Z0-9])");
foreach(Match match in matches)
{
Console.WriteLine(match.Groups[1].Value);
}
This part of the Regex code [a-zA-Z0-9] will capture any character which is alphanumeric.
You can then do a foreach loop on the matches against a dictionary of words.
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I have multiple lines in a text file.
The text file looks similar to this:
Column 1 Column 2 Column 3
12345 stack overflow 12345678
I need a regular expression to check this and then grab column two. My problem is column two can be one or multiple words and I need it to be one item in the string when I grab it or grab other columns.
Read the file line by line and match it using the following regex:
^\d*\s*([\w\s]*\w)\s*\d*$
Now, the 1st named subgroup should give you what you need. I'm not exactly sure about C# syntax, but for notepad++, $1 works well.
The ^ ensures that the regex starts matching from the very beginning of the read line and the $ ensures that it matches up till the very end.
The default greedy matching of the regex assures that no extra spaces are captured in the beginning of the column two content and the \w at the end ensures no trailing spaces.
If the carriage return and new-line characters are read by your platform as well, you can modify it as:
^\s*\d*\s*([\w\s]*\w)\s*\d*\s*$
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I have a string like this
ABCD$-$ToBeFetched1/$-$ToBeFetched2/$-EF$GH
How do I retrieve the string between $ and /$?
Expected string should be
ToBeFetched1
ToBeFetched2
Regex r = new Regex(Regex.Escape("-$") + "(.*?)" + Regex.Escape(#"/$"));
MatchCollection matches = r.Matches("ABCD$-$ToBeFetched1/$-$ToBeFetched2/$-EF$GH");
foreach (Match match in matches)
{
Console.WriteLine(match.Groups[1].Value);
}
Here this will work for sure.
Since you have "open" and "close" markers, the regex expression would obviously be built around this form:
[head-marker: $] [the content you are interested in: anything] [tail-marker: /$]
so, with addition of a parentheses to form a capturing group:
$(.*)$
However, two problems here: * expressions are greedy (and you dont want it to be, as you want all smallest matches possible) - so it has to be weakened, and also the $ is a special character in regex, so it has to be escaped:
\$(.*?)/\$
this forms almost-good expression. It will however falsely match agains such input:
aaaaa/$bbbbb/$ccccc -> bbbbb
because the "head-marker" can skip the slash and hit the first dollar sign what most probably you wouldn't want. Hence, some lookbehind would be useful here too:
(?!</)\$(.*?)/\$
The ?!<XXXX instructs to match only if XXXX does not precede the potential match.
See also MSDN: Regex syntax and operators
edit: actually Arie's suggestion is much simplier as it doesn't use capturing group. Note the small difference though: Arie's example explicitely fobids the data to contain a dollar sign, so ABCD$-$ToBeFe$tched1/$- will result in tched1 not ToBeFe$tched1. If you need the latter, just change the inner [^$] part. Think and pick what you actually need!
Using String Methods:
string s ="ABCD$-$ToBeFetched1/$-$ToBeFetched2/$-EF$GH";
var results = s.Split('-')
.Where(x=> x.StartsWith("$") && x.EndsWith("/$"))
.Select(y=> y.Substring(1,y.Length - 3));
//Console.WriteLine("string1: {0}, string2:{1}",results.ToArray());
(?<=\$)[^$]{1,}(?=/\$)
(?<=\$) - positive lookbehind: it ensurers your match starts right after $ ($ not included in the match)
[^$]{1,} - matches characters other than $; {1,} instead of * to ensure there will be no empty matches (for strings lilke "$/$")
(?=/\$) - positive lookahead: it ensures your match ends right before /$ (/$ not included in the match)
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Hi I need to match this format
N - Number
NN,NN
or
NN.NN
also
N,N and N.N
and combinations
N.NN and N,NN or NN,N and NN.N
Here's your regex:
\d{1,2}[.,]\d{1,2}
See it here in action: http://regexr.com?2vman
Here's a slightly different version:
\d\d?[.,]\d\d?
See it here in action: http://regexr.com?2vmaq
If you want to also match with out a decimal, use this:
\d\d?[.,]?\d{0,2}
See it here in action: http://regexr.com?2vml4
How about:
\d{1,2}(?:[.,]\d{1,2})?
explanation:
\d{1,2} : one or two digits
(?: : start non capture group
[.,] : . or ,
\d{1,2} : one or two digits
)? : end group, optional
Why match it?
Just remove the commas and use the actual number:
Regex.Replace("8,675,309.02", "(,)", string.Empty) // Outputs 8675309.02
If this is a validation scenario, using int.Parse will let you know if its valid.
I would go with something like this:
Regex regex = new Regex(#"\d{1,2}[\.,]\d{1,2}");