c# – 解析邮件地址的正则表达式

注意：STREETTYPES和QUADRANT常量分别包含所有相关的街道类型和象限.

我在这里添加了一个子集：

private const string STREETTYPES = @"ALLEY|ALY|ANNEX|AX|ARCADE|ARC|AVENUE|AV|AVE|BAYOU|BYU|BEACH|...";

private const string QUADRANTS = "N|NORTH|S|SOUTH|E|EAST|W|WEST|NE|NORTHEAST|NW|NORTHWEST|SE|SOUTHEAST|SW|SOUTHWEST";

HouseNumber,Quadrant,StreetName和StreetType都是该类的属性.

private void Parse(string line1)
    {
        HouseNumber = string.Empty;
        Quadrant = string.Empty;
        StreetName = string.Empty;
        StreetType = string.Empty;

        if (!String.IsNullOrEmpty(line1))
        {
            string noPeriodsLine1 = String.Copy(line1);
            noPeriodsLine1 = noPeriodsLine1.Replace(".","");

            string addressParseRegEx =
                @"(?ix)
            ^
            s*
            (?:
               (?<housenumber>d+)
               (?:(?:s+|-)(?<quadrant>" +
                QUADRANTS +
                @"))?
               (?:(?:s+|-)(?<streetname>S+(?:s+S+)*?))??
               (?:(?:s+|-)(?<quadrant>" +
                QUADRANTS + @"))?
               (?:(?:s+|-)(?<streettype>" + STREETTYPES +
                @"))?
               (?:(?:s+|-)(?<streettypequalifier>(?!(?:" +
                QUADRANTS +
                @"))(?:d+|S+)))?
               (?:(?:s+|-)(?<streettypequadrant>(" +
                QUADRANTS + @")))??
               (?:(?:s+|-)(?<suffix>(?:ste|suite|posbox|apt)s*S*))?
            |
               (?:(?:po|postoffice|posts+office)s+boxs+(?<postofficebox>S+))
            )
            s*
            $
            ";
            Match match = Regex.Match(noPeriodsLine1,addressParseRegEx);
            if (match.Success)
            {
                HouseNumber = match.Groups["housenumber"].Value;
                Quadrant = (string.IsNullOrEmpty(match.Groups["quadrant"].Value)) ? match.Groups["streettypequadrant"].Value : match.Groups["quadrant"].Value;
                if (match.Groups["streetname"].Captures.Count > 1)
                {
                    foreach (Capture capture in match.Groups["streetname"].Captures)
                    {
                        StreetName += capture.Value + " ";
                    }
                    StreetName = StreetName.Trim();
                }
                else
                {
                    StreetName = (string.IsNullOrEmpty(match.Groups["streetname"].Value)) ? match.Groups["streettypequalifier"].Value : match.Groups["streetname"].Value;
                }
                StreetType = match.Groups["streettype"].Value;

                //if the matched street type is found
                //use the abbreviated version...especially for credit bureau calls
                string streetTypeAbbreviation;
                if (StreetTypes.TryGetValue(StreetType.ToUpper(),out streetTypeAbbreviation))
                {
                    StreetType = streetTypeAbbreviation;
                }
            }
        }

    }