RegEx for newbie

[Praveen]

Im new to C# regEx.
I want to do a validation in array of integers and alphanumeric, to know
each item is a number between 250 and 350 using regEx.
string[] Arr= new string[] {"191", "677", "31", "901", "250", "100", "313",
"219", "1234567", "abc123"};



thanks,
Praveen

 

[Jani Järvinen [MVP]]

Hi Praveen,

I want to do a validation in array of integers and alphanumeric, to know
each item is a number between 250 and 350 using regEx.
string[] Arr= new string[] {"191", "677", "31", "901", "250", "100",
"313", "219", "1234567", "abc123"};

If you know all (or most) of your strings are just numbers in string format,
I would probably convert the numbers to an integer, and then compare the
result with 250 and 350.

However if you still would want to use regex patterns, here's basically what
you need:

- if the number starts with 2, allow numbers 5-9 in 2nd position and any
number from 0-9 in the 3rd, or
- if the number starts with 3, allow numbers 0-4 in 2nd position and 0-9 in
the 3rd, or
- if the number starts with 3, allow number 5 in 2nd position and 0 in the
3rd.

If my morning brain works OK, that should do it. Here's also a nice site
that I've found helpful:

http://www.regular-expressions.info/tutorial.html

--
Regards,

Mr. Jani Järvinen
C# MVP
Helsinki, Finland
(e-mail address removed)
http://www.saunalahti.fi/janij/

 

[David Boucherie & Co]

Im new to C# regEx.

I want to do a validation in array of integers and alphanumeric, to know
each item is a number between 250 and 350 using regEx.
string[] Arr= new string[] {"191", "677", "31", "901", "250", "100", "313",
"219", "1234567", "abc123"};

Included a little piece of code as an example.
The regular expression for your problem is:

^(2[5-9][0-9])|(3([0-4][0-9])|(50))$


-----------------------------------------------
private void CheckInput()
{
StringBuilder sb = new StringBuilder();
string[] arr = new string[]
{ "191", "677", "31", "901", "250", "100", "313", "219",
"1234567", "abc123" };
foreach ( string s in arr )
{
sb.Append( s );
sb.Append( " evaluates to " );
sb.Append( IsValid( s ) );
sb.Append( "\n" );
}
MessageBox.Show( sb.ToString() );
}

private bool IsValid( string s )
{
Regex re = new Regex( "^(2[5-9][0-9])|(3([0-4][0-9])|(50))$" );
return re.IsMatch( s );
}