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I'm trying to disallow commas in a string entered into a textbox. Here is what I have so far:
[RegularExpression (@"?[^,]*$",
ErrorMessage = "Commas are not allowed in the subtask title. Please remove any and try again")]
This is probably my 5th or 6th attempt, nothing so far has worked. Any help would be appreciated.
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The 0-9 indicates characters 0 through 9, the comma , indicates comma, and the semicolon indicates a ; . The closing ] indicates the end of the character set. The plus + indicates that one or more of the "previous item" must be present.
To remove the leading and trailing comma from a string, call the replace() method with the following regular expression as the first parameter - /(^,)|(,$)/g and an empty string as the second. The method will return a copy of the string without the leading or trailing comma. Copied!
$ means "Match the end of the string" (the position after the last character in the string).
Basically (0+1)* mathes any sequence of ones and zeroes. So, in your example (0+1)*1(0+1)* should match any sequence that has 1. It would not match 000 , but it would match 010 , 1 , 111 etc. (0+1) means 0 OR 1.
Try changing your regex to:
"^[^,]+$"
Let's say we're matching against "Hello, world"
The first ^ asserts that we're at the beginning of the string. Next [^,] is a character class which means "Any character except ,." + next to something means "Match this one or more times." Finally, $ asserts that we're now at the end of the string.
So, this regular expression means "At the start of the string (^), match any character that's not a comma ([^,]) one or more times (+) until we reach the end of the string ($).
This regular expression will fail on "Hello, world" - everything will be fine for H, e, l, l, and o, until we reach the comma - at which point the character class fails to match "not a comma".
For some great tutorials about regular expressions, you should read up on http://www.regular-expressions.info/
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