using System;\r\nusing System.Text.RegularExpressions;\r\n\r\nclass Program\r\n{\r\n static void Main()\r\n {\r\n \/\/ Part 1: the input string.\r\n string input = \"abcABC1234567\u314f\u3163\";\r\n\r\n \/\/ Part 2: call Regex.Match.\r\n Match match = Regex.Match(input, @\"[A-Z]{2}\",\r\n RegexOptions.IgnoreCase);\r\n\r\n \/\/ Part 3: check the Match for Success.\r\n if (match.Success)\r\n {\r\n \/\/ Part 4: get the Group value and display it.\r\n string key = match.Groups[0].Value;\r\n Console.WriteLine(key);\r\n }\r\n }\r\n}\r\n\r\n\/\/AB<\/pre>\n \ub2e4\uc74c\uc740 \uc22b\uc790\ub9cc \ucd94\ucd9c\ud560\ub54c \uc4f0\uba74 \ub41c\ub2e4. <\/H4>
\n\ubc18\ub4dc\uc2dc \uc22b\uc790\uac00 \ud558\ub098\uc774\uc0c1 \uc788\uc5b4\uc57c \ub428.<\/p>\nusing System.Text.RegularExpressions;<\/code>\r\n\r\nstring strText = \"abc1234567\u314f\u3163\"\r\nstring strNum = \"\";\r\nstrNum = Regex.Replace(strText, @\"\\D\", \"\");<\/pre>\n=> 1234567
\n\ub2f7\ub137 \uc815\uaddc\uc2dd\uc5d0\uc11c \\d\ub294 \uc22b\uc790. \\D\ub294 \uc22b\uc790\uac00 \uc544\ub2cc \ubb38\uc790\ub97c \uc758\ubbf8<\/p>\n
<\/p>\n
abc\u2026\tLetters\r\n123\u2026\tDigits\r\n\\d\tAny Digit\r\n\\D\tAny Non-digit character\r\n.\tAny Character\r\n\\.\tPeriod\r\n[abc]\tOnly a, b, or c\r\n[^abc]\tNot a, b, nor c\r\n[a-z]\tCharacters a to z\r\n[0-9]\tNumbers 0 to 9\r\n\\w\tAny Alphanumeric character\r\n\\W\tAny Non-alphanumeric character\r\n{m}\tm Repetitions\r\n{m,n}\tm to n Repetitions\r\n*\tZero or more repetitions\r\n+\tOne or more repetitions\r\n?\tOptional character\r\n\\s\tAny Whitespace\r\n\\S\tAny Non-whitespace character\r\n^\u2026$\tStarts and ends\r\n(\u2026)\tCapture Group\r\n(a(bc))\tCapture Sub-group\r\n(.*)\tCapture all\r\n(abc|def)\tMatches abc or def<\/pre>\n","protected":false},"excerpt":{"rendered":"