concatenating regex pattern in C#

Question

I have a C# project that requires me to capture a string value from a html stream.

The pattern I need to match is:

XXXX-abc

Where:

XXXX = a 4 character integer

followed by a -

abc =  a 3 character alphanumeric.

I looked at txt2re.com and got

  string re1="(\\d)";   // Any Single Digit 1  
  string re2="(\\d)";   // Any Single Digit 2
  string re3="(\\d)";   // Any Single Digit 3
  string re4="(\\d)";   // Any Single Digit 4
  string re5="(-)"; // Any Single Character 1
  string re6="((?:[a-z][a-z]*[0-9]+[a-z0-9]*))";    // Alphanum 1

The thing I am having difficulty with is combining it into one expression instead of 6. I know I can do:

Regex r = new Regex(re1+re2+re3+re4+re5+re6,RegexOptions.IgnoreCase|RegexOptions.Singleline);

However, my OCD cringes at this method :)

sebmaldo · Accepted Answer · 2013-02-12 18:08:37Z

1

You can use the expresion \d{4}-\w{3} 4 digits follow by - follow by 3 alphanumerical characters. Here is a good site to test and learn about the regular expresion.

answered Feb 12, 2013 at 18:08

sebmaldo

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