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I have to check if string contains only lowercase letters, from 'd' onwards, and the symbols '{', '}', '|', '#'.
I have tried to create Regex but it matches substrings which is not the desired behaviour (the second test mustn't match in the example which I add). I don't know how to explain that the order isn't important and the strings must contain only of the allowed characters. Regex101
[d-z]+[{}|#]+
This regex matches arx#vkdww#qrw#sdvv and this isn't right. How can I fix it?
Thank you in advance!
Your pattern [d-z]+[{}|#]+ matches 1+ times a char d-z in a character class followed by one of the chars listed in the character class [{}|#]+
You have to use anchors to assert the start ^ and end $ of the string and use 1 character class containing all the allowed characters instead of 2:
^[d-z{}|#]*$
Regex demo
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I have a scenario in C#:
Input is->
Sachin.Dutta : trimbegging space :: delete spaceafter
Expected output->
Sachin.Dutta:trimbegging space::delete spaceafter
First,I need to split the string based on : or ::
Then trim whitespaces from beginning and end of every word
Then combine the words to get expected output.
I can write code using for loop to separate words and again recombine them.But,is there any better way using LINQ or Regex for this ?
Use Regex with pattern #"\s*:\s*"
var input = "Sachin.Dutta : trimbegging space :: delete spaceafter";
var result = Regex.Replace(input, #"\s*:\s*", ":");
Output
Sachin.Dutta:trimbegging space::delete spaceafter
Explanation
\s* matches any whitespace character (equal to [\r\n\t\f\v ])
* Quantifier — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)
: matches the character : literally (case sensitive)
\s* matches any whitespace character (equal to [\r\n\t\f\v ])
* Quantifier — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)
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What regex pattern can I use to match the following:
Dxx-xxxx/xxx
So:
- Any string that starts with character 'D'
- Has any number of any character between the 'D' and the '-'
- Has any number of any character between the '-' and the '/'
- Has any number of any character after the '/'
Apologies if I haven't explained this very well!
What is so difficult on D.*-.*/.*?
If you want to ensure that there is at least one character for behind the D, - and / respectivly you should use .+ instead of those .*.
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I need a Reqular expression to identify string in following format in my C# code. The string will always start with "REG" and contain 3 underscores with 2 words and one number between the underscores. See below example:
Example: "REG_SOFTWARE_SECURITY_1234"
I used below REGEX expression suggested by your forums:
"\b[a-zA-Z0-9_]+\b"
But it passes the incorrect inputs also like:
REG_1234
So, it should only pass input in format - "REG_SOFTWARE_SECURITY_1234" Any suggestions?
I dont see issue with your regex. You might be using it incorrectly in c#.
Try this
var str="ALPHABET_ ALPHABET _ ALPHABET _99";
var res = Regex.Matches(str,#"\b[a-zA-Z0-9_]+\b");
foreach (Match match in res)
{
Console.WriteLine(match.Value);
}
Fiddle Here
The backslashes in your search string are not being interpreted as you expect. The C# string "\b[a-zA-Z0-9_]+\b" starts and ends with a "backspace" 0x0008 character.
To match the example string you need to use either "\\b[a-zA-Z0-9_]+\\b" or #"\b[a-zA-Z0-9_]+\b" as the regular expression.
If the task is to match a string with two words and one number separated by three underscores then the following should work:
#"\b[a-zA-Z]+_[a-zA-Z]+_[a-zA-Z]+_[0-9]+\b"
Did you mean a letter by ALPHABET ?
then you could try \w+_ \w+ _ \w+ _\d+, if you intended whitespaces, and you are searching for words, not just letters.
If you want to find a pattern like Letter Underscore Blank etc. , try \w_ \w _ \w _\d.
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We need to validate password against following pattern.
“Xabcdef99*” [1st char uppercase, 2nd to 7th chars lowercase, 8th to 9th digits and last char a symbol ]
Can someone provide me Regex for the same? How I can validate following password against that Regex in C#.
Userpcs12* --> Valid
Testeur333 --> Invalid (because last char is not symbol)
userpcs12* --> Invalid (because first char is not uppercase)
You may try this,
^[A-Z][a-z]{6}\d{2}[~!##$%^&*]$
Add the symbols you want inside the last character class.
or
^[A-Z][a-z]{6}\d{2}\W$
\W matches any non-word character. Change this to [\W_] if you treat _ as special charcater.
Try this:
Regex regex = new Regex(#"^[A-Z][a-z]{6}\d{2}\W$");
Assert.IsTrue(regex.IsMatch("Xabcdef99*"));
Assert.IsTrue(regex.IsMatch("Xabcdef99$"));
Assert.IsFalse(regex.IsMatch("Testeur333"));
Assert.IsFalse(regex.IsMatch("userpcs12*"));
Check this regex:
\A\p{Lu}\p{Ll}{6}\d{2}[~!##$%^&*]\z
\p{Lu} matches uppercase letters
\p{Ll} matches lowercase letters
Demo on regex101
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I need to parse the email address from a mailto tag. I am looking for a way to do this via RegEx in C#.
Example input:
<mailto:abc#xyz.com>
Example output:
abc#xyz.com
In general, it's a very bad idea to use regular expressions for HTML parsing. Instead, take a look at the Html Agility Pack. For the specific input you provided, you may use:
(?<=\<mailto:).*(?=\>)
Here's a code sample:
var emailTag = "<mailto:abc#xyz.com>";
var emailValue = Regex.Match(emailTag, #"(?<=\<mailto:).*(?=\>)").Value;
Console.WriteLine(emailValue);
A simple Regex to strip anything in a mailto tag would be
<mailto:(.*?)>
You could use:
[\w\d]+\#[\w\d]+\.com
[\w\d] <----This matches any letter or character. \w matches any letter. \d matches anynumber.
+ <----One or more of previous item, in this case [\w\d]+ one or more letters or numbers
\# <----Simply matches the # symbol but it needs to be escaped with a \ as it is a special character
[\w\d]+ <----Same again
\. <---- Same concept as the # as . is a special character so it needs to be escaped
In your example:
[\w\d]+=abc
\#=#
[\w\d]+=xyz
\.=.
com=com
If your wanting to match special characters as well as letters and digits then just replace [\w\d]+ with [\S]+ (make sure s is capital).
[\S]+ <---Matches anything that is not a space.
You will have to do variations to include .co.uk and .org etc.
http://www.regular-expressions.info/reference.html <----This is very useful!