if match: return match.group(1) # 返回第一个匹配到的括号内的内容 else: return None text = "Hello (World)" result = find_first_parentheses(text) print(result) 运行以上代码,输出结果为: 代码语言:txt 复制 World 在这个例子中,我们定义了一个find_first_
import re def extract_between_pattern(pattern, text): result = re.search(pattern, text) if result: return result.group(1) else: return None text = "This is a sample text between start and end." pattern = "between (.*) and" result = extract_between_pattern(pattern, text) print(r...
int[] gnums = r.GetGroupNumbers(); //首次匹配 Match m = r.Match(text); while (m.Success) { //从组1开始 for (int i = 1; i < gnums.Length; i++) { Group g = m.Group(gnums[i]); //获得这次匹配的组 Console.WriteLine("Group"+gnums[i]+"=["+g.ToString()+"]"); //...
staticstringCustomReplace(System.Text.RegularExpressions.Match m) {returnm.Groups[1].Value;//直接返回分组1}stringsourceString="...";stringpattern=@"(A\d{1,2})(,A\d{1,2})";System.Text.RegularExpressions.MatchEvaluator myEvaluator=newSystem.Text.RegularExpressions.MatchEvaluator(CustomReplace);Syst...
Return a list of all non-overlapping matches in the string. If one or more groups are present in the pattern, return a list of groups; this will be a list of tuples if the pattern has more than one group. Empty matches are included in the result. ...
capture group "0" value is:"19/24" capture group "1" value is:"19" capture group "2" value is:"24" matched count: 1 现在清楚了吧,Regex对象把匹配的结果放入组0中。同时,匹配的组信息也放入了对应的组中。组的名称在默认的情况下,是从1开始依次增加的整数。0作为保留名称,专门用于指示匹配的整...
return false; } for (int i = 0; i < s.length(); i++) { char c = s.charAt(i); if (c < '0' || c > '9') { return false; } } return true; } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 对于上述问题的求解而言,我们只解决了长度的问题,内容必须...
; // Return output dataset as a DataFrame // return output; } } } 編譯並建立 DLL 檔案 將您的類別和相依性封裝到 DLL 中。 建立名為 .csproj 的RegexSample.csproj 檔案,並將下列程式碼複製到該檔案中。 C# 複製 <Project Sdk="Microsoft.NET.Sdk"> <PropertyGroup> <TargetFramew...
1. 2. 4、Replace(Input,patter,replacement或evaluator [,options]) 替换 用给定的Replacement替换input中的匹配。 Console.WriteLine(Regex.Replace("this test*", "[^a-zA-Z]", "()")); //this()test() Console.WriteLine(Regex.Replace("sevenyear", @"\w+", m => { return m.Value.ToUpper()...
{ $addFields: { returnObject: { $regexFind: { input: "$description", regex: /tier/ } } } } ]) 该操作会返回以下内容,其中只有最后一条记录与模式匹配,并且返回的 idx 为2(如果使用字节索引,则返回 3) { "_id" : 1, "description" : "Single LINE description.", "returnObject" : null }...