正则表达式(Regular Expression,在代码中常简写为regex、 regexp、RE 或re)是预先定义好的一个“规则字符率”,通过这个“规则字符串”可以匹配、查找和替换那些符合“规则”的文本。 虽然文本的查找和替換功能可通过字符串提供的方法实现,但是实现起来极为困难,而且运算效率也很低。而使用正则表达式实现...
("text",0));// Filter text containing specific substring using regex expression//DataFrameColumn texts = input.Columns["text"];for(inti =0; i < texts.Length; ++i) {if(Regex.IsMatch((string)texts[i], sqlParams["@regexExpr"])) { output.Append(input.Rows[i],true); } }/...
string[] drives = Environment.GetLogicalDrives(); string driveNames = String.Empty; foreach (string drive in drives) driveNames += drive.Substring(0,1); // Create regular expression pattern dynamically based on local machine information. string pattern = @"\\\" + Environment.MachineName + ...
Searches a string for a specific pattern using a regular expression to do matching and replaces the first instance with a replacement string. Regular expression constructs can contain characters, character classes, and other classes and quantifiers. Seehttp://java.sun.comfor details about the Java...
Console.WriteLine("string:"{0}"expression:"{1}"match result is:", ms, expression); foreach(Match minmatches) { Console.WriteLine("match string is:"{0}", length: {1}",m.Value.ToString(), m.Value.Length); } Console.WriteLine("matched count: {0}", matches.Count); ...
Regex 正则表达式(Regular expression):outline:1.常用re flag参数 2.常用re function 3.当匹配成功时返回一个对象 4. Quantifier 5.Character Classes 6.Negative Character Class 7. Word Boundary Anchor 8. Be…
Console.WriteLine(" string: "{0}" expression: "{1}" match result is:", ms, expression); foreach(Match m in matches) { Console.WriteLine("match string is: "{0}", length: {1}",m.Value.ToString(), m.Value.Length); } Console.WriteLine("matched count: {0}", matches.Count); ...
Regex r = new Regex(pat, RegexOptions.IgnoreCase); // Match the regular expression pattern against a text string. Match m = r.Match(text); int matchCount = 0; while (m.Success) { Console.WriteLine("Match"+ (++matchCount)); for (int i = 1; i <= 2; i++) { Group g = m.Gr...
The type of elements to match. For common cases this isstring,wstring,char*orwchar_t*. RXtraits Traits class for elements. Alloc2 The regular expression allocator class. IOtraits The string traits class. IOalloc The string allocator class. ...
string[] drives = Environment.GetLogicalDrives(); string driveNames = String.Empty; foreach (string drive in drives) driveNames += drive.Substring(0,1); // Create regular expression pattern dynamically based on local machine information. string pattern = @"\\\" + Environment.MachineName + @...