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Titleemail address (RFC 2822 mailbox)

^((?>[a-zA-Z\d!#$%&'*+\-/=?^_`{|}~]+\x20*|"((?=[\x01-\x7f])[^"\\]|\\[\x01-\x7f])*"\x20*)*(?<angle><))?((?!\.)(?>\.?[a-zA-Z\d!#$%&'*+\-/=?^_`{|}~]+)+|"((?=[\x01-\x7f])[^"\\]|\\[\x01-\x7f])*")@(((?!-)[a-zA-Z\d\-]+(?<!-)\.)+[a-zA-Z]{2,}|\[(((?(?<!\[)\.)(25[0-5]|2[0-4]\d|[01]?\d?\d)){4}|[a-zA-Z\d\-]*[a-zA-Z\d]:((?=[\x01-\x7f])[^\\\[\]]|\\[\x01-\x7f])+)\])(?(angle)>)$

Your server should serve OpenSearch plugins using the MIME type application/opensearchdescription+xml. Be sure that your Search Plugin XML is well formed. You can check by loading the file directly into Firefox. Ampersands in the template URL need to be escaped with &Amp;Amp;Amp; and tags need to be closed with a trailing slash or matching end tag. The xmlns attribute is important, without it you could get an error message indicating that "Firefox could not download the search plugin from: (URL)". Note that you must include a text/html URL — search plugins including only Atom or RSS URL types (which is valid, but Firefox doesn't support) will also generate the "could not download the search plugin" error. Remotely fetched favicons must not be larger than 10KB

QuickGraph 2.0 provides generic directed graph datastructures and algorithms for .Net 2.0. QuickGraph comes with algorithms such as depth first seach, breath first search, shortest path, network flow etc... QuickGraph supports GLEE and Graphviz to render the graphs.