hyphen in regular expression (cSharp)

[jayanthigk2004@yahoo.com]

Input
a-

Patterns

\w*-*
\w*(-*)
\w*(-)*
\w*[-]*

No of the patterns results in a match. Tried escaps(\) before hyphen
still no match.

My requirement is to make sure a string contains only digits, alphabets
and hypen (each 0 or more times).

[Kevin Spencer]

Re: hyphen in regular expression (cSharp)

Well, you're not being very specific about your requirements, but the
following would work with them as you have stated them:

[\w-]*

Translated: Match any combination of 0 or more of digits, alphabetical
characters, or hyphens.

--
HTH,

Kevin Spencer
Microsoft MVP
Computer Control Freak

http://unclechutney.blogspot.com

A man, a plan, a canal, a palindrome that has.. oh, never mind.

<jayanthigk2004 @yahoo.comwrote in message
news:1160345578 .187544.302930@ k70g2000cwa.goo glegroups.com.. .

Input
a-
>
Patterns
>
\w*-*
\w*(-*)
\w*(-)*
\w*[-]*
>
No of the patterns results in a match. Tried escaps(\) before hyphen
still no match.
>
My requirement is to make sure a string contains only digits, alphabets
and hypen (each 0 or more times).
>

[Truong Hong Thi]

Re: hyphen in regular expression (cSharp)


I would think all of those patterns result in matches. Could it be some
mistake in your code?

jayanthigk2004@ yahoo.com wrote:

Input
a-
>
Patterns
>
\w*-*
\w*(-*)
\w*(-)*
\w*[-]*
>
No of the patterns results in a match. Tried escaps(\) before hyphen
still no match.
>
My requirement is to make sure a string contains only digits, alphabets
and hypen (each 0 or more times).

[Kevin Spencer]

Re: hyphen in regular expression (cSharp)

The patterns would certainly match "a-" but not the requirements he posted.
It is a matter of sequence. The regular expression:

\w*-*

literally means "a match is zero or more word characters *followed by* zero
or more hyphen characters. So, the string "-a" would result in 2 matches,
one for the "-" and one for the "a", while the regular expression:

[\w-]*

literally means "a match is any combination 0 or more of word characters
and/or hypens, so that the string "-a" would result in a single match
containing both characters.

--
HTH,

Kevin Spencer
Microsoft MVP
Chicken Salad Shooter

http://unclechutney.blogspot.com

A man, a plan, a canal, a palindrome that has.. oh, never mind.

"Truong Hong Thi" <thi1981@gmail. comwrote in message
news:1160370247 .045671.246630@ i42g2000cwa.goo glegroups.com.. .

>
I would think all of those patterns result in matches. Could it be some
mistake in your code?
>
jayanthigk2004@ yahoo.com wrote:

>Input
>a-
>>
>Patterns
>>
>\w*-*
>\w*(-*)
>\w*(-)*
>\w*[-]*
>>
>No of the patterns results in a match. Tried escaps(\) before hyphen
>still no match.
>>
>My requirement is to make sure a string contains only digits, alphabets
>and hypen (each 0 or more times).

>

[jayanthigk2004@yahoo.com]

Re: hyphen in regular expression (cSharp)

My requirement is for validation and it should allow only digits,
alphabets and hyphens in the text the user enters.

Thanks

Kevin Spencer wrote:

The patterns would certainly match "a-" but not the requirements he posted.
It is a matter of sequence. The regular expression:
>
\w*-*
>
literally means "a match is zero or more word characters *followed by* zero
or more hyphen characters. So, the string "-a" would result in 2 matches,
one for the "-" and one for the "a", while the regular expression:
>
[\w-]*
>
literally means "a match is any combination 0 or more of word characters
and/or hypens, so that the string "-a" would result in a single match
containing both characters.
>
--
HTH,
>
Kevin Spencer
Microsoft MVP
Chicken Salad Shooter

http://unclechutney.blogspot.com

>
A man, a plan, a canal, a palindrome that has.. oh, never mind.
>
"Truong Hong Thi" <thi1981@gmail. comwrote in message
news:1160370247 .045671.246630@ i42g2000cwa.goo glegroups.com.. .

I would think all of those patterns result in matches. Could it be some
mistake in your code?

jayanthigk2004@ yahoo.com wrote:

Input
a-
>
Patterns
>
\w*-*
\w*(-*)
\w*(-)*
\w*[-]*
>
No of the patterns results in a match. Tried escaps(\) before hyphen
still no match.
>
My requirement is to make sure a string contains only digits, alphabets
and hypen (each 0 or more times).

[Kevin Spencer]

Re: hyphen in regular expression (cSharp)

I answered your question. See below.

--
HTH,

Kevin Spencer
Microsoft MVP
Chicken Salad Shooter

http://unclechutney.blogspot.com

A man, a plan, a canal, a palindrome that has.. oh, never mind.

<jayanthigk2004 @yahoo.comwrote in message
news:1160409842 .083229.201370@ e3g2000cwe.goog legroups.com...

My requirement is for validation and it should allow only digits,
alphabets and hyphens in the text the user enters.
>
Thanks
>
Kevin Spencer wrote:

>The patterns would certainly match "a-" but not the requirements he
>posted.
>It is a matter of sequence. The regular expression:
>>
>\w*-*
>>
>literally means "a match is zero or more word characters *followed by*
>zero
>or more hyphen characters. So, the string "-a" would result in 2 matches,
>one for the "-" and one for the "a", while the regular expression:
>>
>[\w-]*
>>
>literally means "a match is any combination 0 or more of word characters
>and/or hypens, so that the string "-a" would result in a single match
>containing both characters.
>>
>--
>HTH,
>>
>Kevin Spencer
>Microsoft MVP
>Chicken Salad Shooter
>http://unclechutney.blogspot.com
>>
>A man, a plan, a canal, a palindrome that has.. oh, never mind.
>>
>"Truong Hong Thi" <thi1981@gmail. comwrote in message
>news:116037024 7.045671.246630 @i42g2000cwa.go oglegroups.com. ..

>
I would think all of those patterns result in matches. Could it be some
mistake in your code?
>
jayanthigk2004@ yahoo.com wrote:
>Input
>a-
>>
>Patterns
>>
>\w*-*
>\w*(-*)
>\w*(-)*
>\w*[-]*
>>
>No of the patterns results in a match. Tried escaps(\) before hyphen
>still no match.
>>
>My requirement is to make sure a string contains only digits,
>alphabets
>and hypen (each 0 or more times).
>

>