{"id":349,"date":"2010-09-08T22:57:30","date_gmt":"2010-09-09T06:57:30","guid":{"rendered":"http:\/\/www.andreanolanusse.com\/en\/?p=349"},"modified":"2011-02-02T03:13:11","modified_gmt":"2011-02-02T11:13:11","slug":"using-regular-expressions-to-validate-ip-address-with-delphi-xe","status":"publish","type":"post","link":"http:\/\/www.andreanolanusse.com\/en\/using-regular-expressions-to-validate-ip-address-with-delphi-xe\/","title":{"rendered":"Using regular expressions to validate IP address with Delphi XE"},"content":{"rendered":"

One of the new Delphi XE features is the RTL support for regular expressions \u00a0(unit RegularExpressions), regular expressions provide a concise and flexible means for matching strings of text, such as particular characters, words, or patterns of characters.<\/p>\n

The follow example shows how to use regexp to validate IP address.<\/p>\n

program RegExpIP;\r\n\r\n{$APPTYPE CONSOLE}\r\n\r\nuses\r\n  SysUtils,\r\n  RegularExpressions;\r\n\r\nvar\r\n ipRegExp : String;\r\nbegin\r\n  try\r\n\r\n    ipRegExp := '\\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\b';\r\n\r\n  if TRegEx.IsMatch(paramstr(1), ipRegExp) then\r\n    Writeln('Text DOES match the regular expression')\r\n  else\r\n    Writeln('Text DOES NOT match the regular expression');\r\n\r\n  except\r\n    on E: Exception do\r\n      Writeln(E.ClassName, ': ', E.Message);\r\n  end;\r\nend.<\/pre>\n
Just execute the program and pass the IP address as parameter.<\/p>\n
In this case the IP address is valid
\nRegExpIP 200.100.2.21
\nText DOES match the regular expression
\n<\/strong><\/p>\n
In this case not, the IP address finish with 263, it is out of the range which is 255
\nRegExpIP 200.100.2.263
\nText DOES NOT match the regular expression
\n<\/strong><\/p>\n
On the RAD Studio demo repository at sourceforge<\/a> you can find a project sample showing other regular expressions that you can use.<\/p>\n
As well download the Delphi XE trial and start looking the other great features on this release, \u00a0download the trial here<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
One of the new Delphi XE features is the RTL support for regular expressions \u00a0(unit RegularExpressions), regular expressions provide a concise and flexible means for matching strings of text, such as particular characters, words, or patterns of characters. The follow example shows how to use regexp to validate IP address. program RegExpIP; {$APPTYPE CONSOLE} uses […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_s2mail":"","footnotes":""},"categories":[10],"tags":[90,53],"class_list":["post-349","post","type-post","status-publish","format-standard","hentry","category-delphi","tag-delphi","tag-regexp"],"yoast_head":"\nUsing regular expressions to validate IP address with Delphi XE | Andreano Lanusse | Technology and Software Development<\/title>\n<meta name=\"description\" content=\"One of the new Delphi XE features is the RTL support for regular expressions \u00a0(unit RegularExpressions), regular expressions provide a concise and\" \/>\n<meta name=\"robots\" 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