Here is the code I am using to find transit numbers of the form RB\\d{4}, SW\\d{4} and S\\d{4}:
Regex transitRegex = new Regex("^(RB|SW?)(<?transit>\\d{4}).*");
Match m1 = transitRegex.Match(transitNumber);
if (m1.Success)
{
Regex transitRegexNoZeroes = new Regex("0+(<?transitNoZeroes>\\d+)");
Match m2 = transitRegexNoZeroes.Match(m1.Groups["transit"].Value);
if (m2.Success)
{
transitNumber = m2.Groups["transitNoZeroes"].Value.ToString();
MessageBox.Show(transitNumber, "Transit Number", MessageBoxButtons.OK);
}
else
{
transitNumber = m1.Groups["transit"].Value.ToString();
}
}
else
{
MessageBox.Show("Could not find transit number in " + transitNumber, "Parsing Error", MessageBoxButtons.OK);
}
However I am failing to match any lines. Here is an example of a line that fails:
RB80720C1XX - Intermittent COMM lOSS ****CHRONIC****
For the life of me I can't figure out what's wrong with the regex. Any advice is appreciated.
Regards.
EDIT: Inner match edited to allow numbers with leading zeroes to still contain zeroes.
Your first pattern is a little off. Try this instead:
@"^(RB|SW?)(?<transit>\d{4})"
Note, the position of the question mark. You can test the pattern here .
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