一个表达式后接一个 “*” 表示重复任意次数(包括0次)。一个表达式后接一个 “+” 表示重复任意次数(但是至少1次)。如果表达式使用 regex_constants::bk_plus_qm编译(译注:regex类构造函数的flag参数),那么 “+” 是一个普通的字符(译注:即“+” 表示其字面意义), “\+” 用来表示重复一或多次。一个表达...
Regex(pattern); string result = rgx.Replace(input, replacement); Console.WriteLine("Original String: {0}", input); Console.WriteLine("Replacement String: {0}", result); } } // The example displays the following output: // Original String: This is text with far too much white space. ...
" "; string result = Regex.Replace(input, pattern, replacement); Console.WriteLine("Original String: {0}", input); Console.WriteLine("Replacement String: {0}", result); } } // The example displays the following output: // Original String: This is text with far too much white space. ...
Namespace: System.Text.RegularExpressions Assemblies: netstandard.dll, System.Text.RegularExpressions.dll Indicates whether the regular expression finds a match in the input string. Overloads Expand table IsMatch(String, String, RegexOptions, TimeSpan) ...
()<<" matched\n";std::regex_match("subject",cm,e,std::regex_constants::match_default);std::cout<<"the matches were:";for(unsignedi=0;i<sm.size();++i){std::cout<<"["<<sm.str()<<"]";}std::cout<<'\n';for(unsignedi=0;i<sm.size();++i){std::cout<<"["<<sm[i]<...
" "; string result = Regex.Replace(input, pattern, replacement); Console.WriteLine("Original String: {0}", input); Console.WriteLine("Replacement String: {0}", result); } } // The example displays the following output: // Original String: This is text with far too much white space. ...
" "; string result = Regex.Replace(input, pattern, replacement); Console.WriteLine("Original String: {0}", input); Console.WriteLine("Replacement String: {0}", result); } } // The example displays the following output: // Original String: This is text with far too much white space. ...
如果是single-word: '[\w+\]';如果含有space or punctuation: '\[.+]' In[1]:r'\w''\\w'In[2]:'\\w'\wIn[2]:print(r'\n')\nIn[3]:print('\n')#输出了看不见的换行符,而不是字符`\n` 6.Negative Character Class #要java不要javascriptpattern=r'[Jj]ava[^Ss]' ...
*Matches 0 or more repetitions of the preceding symbol. +Matches 1 or more repetitions of the preceding symbol. ?Makes the preceding symbol optional. {n,m}Braces. Matches at least "n" but not more than "m" repetitions of the preceding symbol. ...
string text = "<10sp>Hello,<1sp>World!<2sp>With<1sp>Regular<1sp>Expressions!"; MatchEvaluator myEvaluator = new MatchEvaluator(rex.spaces); Console.WriteLine(Regex.Replace(text,"<([0-9])*sp>", myEvaluator)); } public string spaces(Match m) { string tmp = ""; ...