C# regulara Expression validation

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Hi I am new to regular expression.I am working on C# win form application.I need to validate one textbox using regular expression which should allow a-z,A-Z,0-9 and special characters like hypen(-),underscore(_),slash(/) and white space.
Please help me to write the Regx expression for the above requirement.

Posted 14-Jan-12 16:38pm

parameswar nayak mgr

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thatraja · Answer 1 · 2012-01-14T18:13:00

Solution 1

Here you go
Expresso - A Tool for Building and Testing Regular Expressions[^]
The 30 Minute Regex Tutorial[^]

Posted 14-Jan-12 18:13pm

thatraja

psychic6000 · Answer 2 · 2012-01-14T19:31:00

Solution 2

here is the ReGex i use for password fields... all the letters and symbols are allowed, and range is from 0 to maximum... * represents= 0 or more than 0 can exists

^[a-zA-Z0-9]*[!,@,#,$,%,^,&,*,?,_,~,-,£,(,)]*$

but this will not allow a letter once a symbol is entered...
so you can modify it to

^[a-zA-Z0-9,!,@,#,$,%,^,&,*,?,_,~,-,£,(,)]*$

Posted 14-Jan-12 19:31pm

psychic6000

Comments

BillWoodruff 15-Jan-12 4:52am

Looks like a solid answer, and I voted it a #5 :)

But, I am curious to ask you ... about using your first RegEx: which you state: "will not allow a letter once a symbol is entered:" does that mean that once you have entered a symbol, then only other symbols can be entered ?

I'd be curious to know why you wrote the first example the way you did.

thanks, Bill

psychic6000 15-Jan-12 4:59am

yes, like
my1name23_!
so there is another thing
^[a-zA-Z0-9,!,@,#,$,%,^,&,*,?,_,~,-,£,(,)]{6,32}$
now this will not allow less than 6 and more than 32 as length

BillWoodruff 15-Jan-12 12:26pm

Very cool, thanks ! best, Bill

Andreas Gieriet 15-Jan-12 8:51am

Why all these commas? Once is enough. The comma does not separate elements in regex, correct?

psychic6000 15-Jan-12 11:54am

thanks for telling... i didnt know that :)