9. Capture Groups 先介绍str. extract(),可用正则从字符数据中抽取匹配的数据,只返回第一个匹配的数据。 注意,extract must enclosed regex in parentheses, which is called capturing group,只是返回分组中的数据,如果给分组取了名称,则该名称就是返回结果中的字段名
\num 向后引用(back-reference)一个子字符串(substring),该子字符串与正则表达式的第 num 个用括号围起来的捕捉群(capture group)子表达式(subexpression)匹配。其中 num 是从 1 开始的十进制正整数,Regex 捕获组上限为 63。例如:(.)\1匹配两个连续的相同字符。 (?:pattern) 匹配pattern 但不获取匹配的子字符...
Roll-over elements below to highlight in the Expression above. Click to open in Reference. (Capturing group #1.Groups multiple tokens together and creates a capture group for extracting a substring or using a backreference. [Character set.Match any character in the set. ...
Capture Group 使用括号( )设置捕获分组,括号内的内容即为捕获分组的内容。 Back Reference 后向引用建立在捕获分组的基础上。若一个regex中有多个捕获分组,则可以在regex中使用"\n"来引用分组。 n指分组的序号,序号的分配方法为:从左往右数左括号"(",第n个左括号包含的内容为第n个分组。 letstr='abcde';let...
A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data 1st Alternative [零幺一二两三四五六七八九十百千万点比] ...
Regex的Match()或Matches()=>Match匹配(MatchCollection)=>Group 组(GroupCollection子模式)=>Capture捕获(CaptureCollection)MatchCollection mc = Regex.Matches("a.b.c.d", @"(\w)\.(\w)"); for (int i = 0; i < mc.Count; i++) { Match match = mc[i]; Console.WriteLine("Match=" + ...
Regex的Match()或Matches()=>Match匹配(MatchCollection)=>Group 组(GroupCollection子模式)=>Capture捕获(CaptureCollection) MatchCollection mc = Regex.Matches("a.b.c.d", @"(\w)\.(\w)"); for (int i = 0; i < mc.Count; i++) { Match match = mc[i]; Console.WriteLine("Match=" + mat...
A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data matches the charactersliterally (case insensitive) 4th Capturing...
Click to open in Reference. ^ Beginning. Matches the beginning of the string, or the beginning of a line if the multiline flag (m) is enabled. ( Capturing group #1. Groups multiple tokens together and creates a capture group for extracting a substring or using a backreference. [^ Negate...
\nBack Reference. Match whatever the nth capturing group matched. n must be a number ≥ 1 and ≤ total number of capture groups in the pattern.Note:Octal escapes, such as \012, are not supported. [pattern]Match any one character from the set. See ICU Regular Expression Character Classes...