FileNotFoundException 找不到由resourceFile参数指定的文件。 PlatformNotSupportedException 仅.NET Core 和 .NET 5+ :不支持创建已编译正则表达式的程序集。 注解 CompileToAssembly(RegexCompilationInfo[], AssemblyName, CustomAttributeBuilder[], String)方法生成一个 .NET Framework 程序集,其中regexinfos数组中定...
This is not quite the same as putting a lookaround in the first branch of a pair of alternatives.Examples:>>> print(regex.match(r'(?:(?=\d)\d+\b|\w+)', '123abc')) <regex.Match object; span=(0, 6), match='123abc'> >>> print(regex.match(r'(?(?=\d)\d+\b|\w+)',...
) character followed by one or more word characters. This match can occur zero or more times. The matched subexpression is not captured. \\ Match a backslash (\) character. ([" + driveNames + "]) Match the character class that consists of the individual drive letters. This match is ...
optionsis not a valid bitwise combination ofRegexOptionsvalues. Examples The following example calls theMatches(String, String)method to identify any word in a sentence that ends in "es", and then calls theMatches(String, String, RegexOptions)method to perform a case-insensitive comparison of the...
One important thing that can not be emphasized enough is this:regex works on characters, not words. Concatenation is implied. image If we search using regex for the patterncat, we are not looking for the word “cat”, but we are looking forcfollowed byafollowed byt. ...
predef word">A word character:[\p{alpha\p{gc=Mark}\p{digit}\p{gc=Connector_Punctuation}\p{Join_Control}]}</td></tr> <tr><th style="vertical-align:top; font-weight:normal" id="non_word">\W</th> <td headers="matches predef non_word">A non-word character:[^\w]</td></tr...
Imagine you are writing an application and you want to set the rules for when a user chooses their username. We want to allow the username to contain letters, numbers, underscores and hyphens. We also want to limit the number of characters in the username so it does not look ugly. We ...
It's not possible to support both simple sets, as used in the re module, and nested sets at the same time because of a difference in the meaning of an unescaped"["in a set. For example, the pattern[[a-z]--[aeiou]]is treated in the version 0 behaviour (simple sets, compatible wi...
You should not use regular expressions to validate email addresses. Instead, in C# use the MailAddress class, like this: try { address = new MailAddress(address).Address; } catch(FormatException) { // address is invalid } The MailAddress class uses a BNF parser to validate ...
\WMatches any character which is not a word character. This is the opposite of\w. If theASCIIflag is used this becomes the equivalent of[^a-zA-Z0-9_]. If theLOCALEflag is used, matches characters which are neither alphanumeric in the current locale nor the underscore. ...