A character in the range: a-z or A-Z [a-zA-Z] Any single character . Alternate - match either a or b a|b Any whitespace character \s Any non-whitespace character \S Any digit \d Any non-digit \D Any word character \w
IsMatch(String, String, RegexOptions) 指示指定的正则表达式是否使用指定的匹配选项在指定的输入字符串中找到匹配项。 IsMatch(ReadOnlySpan<Char>, String, RegexOptions) 指示指定的正则表达式是否使用指定的匹配选项在指定的输入范围中找到匹配项。 IsMatch(String, String) ...
GroupNameFromNumber GroupNumberFromName InitializeReferences IsMatch 匹配 匹配 Replace 拆分 ToString Unescape UseOptionC UseOptionR ValidateMatchTimeout 显式接口实现 Regex.ValueMatchEnumerator RegexCompilationInfo RegexMatchTimeoutException RegexOptions RegexParseError RegexParseException RegexRunner RegexRunnerFactory...
string pattern = @"^[A-Z0-9]\d{2}[A-Z0-9](-\d{3}){2}[A-Z0-9]$"; foreach (string partNumber in partNumbers) try { Console.WriteLine("{0} {1} a valid part number.", partNumber, Regex.IsMatch(partNumber, pattern, RegexOptions.IgnoreCase) ? "is" : "is not", TimeSpan....
Additional parameters specify options that modify the matching operation and a time-out interval if no match is found. Replace(String, String, Int32, Int32) In a specified input substring, replaces a specified maximum number of strings that match a regular expression pattern with a specified ...
using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string input = "This is text with far too much " + "white space."; string pattern = "\\s+"; string replacement = " "; string result = Regex.Replace(input, pattern, replacement); Co...
My credit card number is ***-***-***-3456. 1. 7. 常见正则表达式的陷阱 7.1 贪婪匹配 默认情况下,正则表达式会尽可能匹配更多字符(贪婪模式)。这可能导致意外结果。 示例:贪婪匹配 #include <iostream> #include <regex> int main() { std:...
A regular expression is a “prefix expression” if it starts with a caret (^) or a left anchor (\A), followed by a string of simple symbols. For example, the regex/^abc.*/will be optimized by matching only against the values from the index that start withabc. ...
"[0-9]{3}" => The number was 9.9997 but we rounded it off to 10.0. Test the regular expression2.5 Capturing GroupsA capturing group is a group of subpatterns that is written inside parentheses (...). As discussed before, in regular expressions, if we put a quantifier after a ...
public static String regexIsJJJStartKKKEnd=”^JJJ.*KKK$”; //字符串是否是区号是3或4位数字-(可有可没有)号码任意多少位的数字 public static String regexIsTelePhoneNumber =”[0-9]{3,4}\-?[0-9]+”; //X@X.com.cn public static String regexIsEmail = “\w+@\w+(\.\w{2,3})*\....