i have a textbox in form. i want to write there in the textbox, the path (ex: D:\temp) and after that, i want to create this path. I tried to use this regex but is not working! i want the first letter be upper but is not working. Also i want the string contain ":" and "\" just once. And after ":\" i want to insert some string lowercase @"^[A-Z][:][\][a-z]$" Have some sugestions ? Thanks a lot !
4 Answers
I believe the regular expression you are looking for is
@"^[A-Z]:\\[a-z]+$"
There are two issues with your's. First you didn't delimit the backslash, so it was delimiting the ] which meant you were looking for exactly one ], [, or a through z after the colon. The second issue is that you want to find one or more letters after the backslash so you need to use + for that. Finally the colon and backslash do not have to be in groups.
2 Comments
fiveclubs
Based on the question, I also believe this is what is being asked for, but the OP should be aware that it won't match paths that have more than one nested directory. For example D:\temp\other will not match.
juharr
@fiveclubs It also won't match a file if it has an extension because it doesn't match the dot, and it won't match mixed case directory or file name or anything that has a non alpha character like underscore or a number.
You Can Try this:
[RegularExpression("^("[A-Z][a-z]+$)",
ErrorMessage = "Please Enter Correct Name")]
Description
^Beginning of string[ ]Brackets specifies set of charactersA-Z a-zAll capital/small letters- Consider a space
+one or more letters$Indicates end of string
Comments
Try this regex : [A-Z]:\[a-z]+. Then try ^[A-Z]:\\w+$
Declare your regex like this in your code :
string myRegex = @"[A-Z]:\\[a-z]+"
With this, you only validate paths like D:\Temp, but not D:\Temp\Temp2
Comments
First, examples of what should pass or fail would be helpful.
Second, use a tool to help write the regex that explains what's happening as you go, like Expresso or Regex Fiddle.
Now, on to the question. Here's an example /^[A-Z]:\\[a-z]+$/gm
- ^ - It matches the start of a line
- [A-Z] - matches a single capital letter
- : - matches a colon
- \ - escape the backslash to match a backslash
- [a-z]+ - matches a lowercase letter (the + means 1 or more times)
- $ - match the end of line
Here's an edited version which checks to ensure first character of folder is a capital letter /^[A-Z]:\\[A-Z][a-z]+$/gm
3 Comments
CaffGeek
if you want multiple folders like
D:\one\two we need to make a change to this...also, are you sure you just want lower case foldernames?
roman andrei
yes .. lowercase ... but what if the folder names should have the first letter upper? What should I do?
CaffGeek
Then you have to add that to the regex before the lowercase stuff, like this
/^[A-Z]:\\[A-Z][a-z]+$/gm I added a single check for a capital letter before the lowercase check...currently this regex will pass D:\Fo but fail for D:\F because it requires a capital letter and 1 or more lowercase. Changing the + to a * would change it to 0 or more lowercase letters
[\]should probably be \\ as well