hi:
I am looking to check if the input string is a negative number or a positive number. How can I do this using Regex i.e I am looking for the pattern string to match all inputs against?
Thanks
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Hi,
The | symbol allows you to match alternative tokens e.g. "cat|dog" will match either cat or dog. In our case we wanted to match either a minus or a plus sign at the beginning. (question mark is explained below)
The backslash \ character is used to escape characters that have special meaning in regular expressions. I escaped the + sign so that the regex engine takes it as a character plus symbol rather than its special meaning "one or more" in regular expressions.
The question mark symbol means "zero or none" of the previous symbol.... "\d" is short hand for any digit in the range 0-9. Finally, the dot was escaped using the backslash as it has a special meaning in regex's but we wanted it to simply mean a dot (decimal point in the input number).
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by: Zephyr__Posted on 2006-10-30 at 09:22:38ID: 17835283
Hi, try the following regex, it should match both negative and positive numbers:
(-|\+)?\d+(\.\d+)?
Example:
using System.Text.RegularExpress
...
string data = "-10";
string regex = @"(-|\+)?\d+(\.\d+)?";
Match m = Regex.Match(data, regex);
if (m.Success)
{
MessageBox.Show("Matched: " + m.Value);
}
is that what you were after?