Match m = Regex.Match(“abracadabra”, “(a|b|r)+”); 我们现在有了一个可以用于测试的Match类的实例,例如:if (m.Success)… 如果想使用匹配的字符串...# 第二个组结束(可选) ) # 第一个组结束 + # 匹配一次或多次 ”; //利用x修饰符忽略注释 Regex r = new Regex...打开x...
However, listing both uppercase and lowercase versions of each character becomes tedious if the string is lengthy. Therefore, let’s explore some alternative methods. 4. Using thenocasematchOption Another approach to case-insensitive comparisons is to enable thenocasematchoption within the shell. ...
String.prototype.match() str.match(regexp) 当字符串匹配到正则表达式(regular expression)时,match() 方法会提取匹配项。 varstr ="For more information, see Chapter 3.4.5.1";varre = /(chapter \d+(\.\d)*)/i;varfound =str.match(re); console.log(found); varstr ="ABCDEFGHIJKLMNOPQRSTUVWXYZ...
Tip Lowercase and uppercase letters are distinct in the Regex text language. IgnoreCase changes this. RegexOptions.IgnoreCase Tip 2 We can change how the Regex type acts upon newlines with the RegexOptions enum. This is often useful. RegexOptions.Multiline using System; using System.Text.RegularExpr...
With the original text in A5 and the pattern in A5, the formula takes this shape: =RegExpMatch(A5, $A$2) Or you could use a simpler regular expression for email validation with either a lowercase or uppercase character set: Pattern: \b[\w\.\-]+@[a-z0-9]+[a-z0-9\.\-]*[a...
Theminuteandsecondparts are the same as in expression 1 above. The negative lookahead (?!:) is added to skip strings such as 20:30:80. As PM/AM can be either uppercase or lowercase, we make the function case-insensitive: =RegExpExtract(A5, $A$2, 1, FALSE) ...
| Alternation match. e.g. /(e|d)n/ matches "en" and "dn"• Any character, except \n or line terminator[ab] a or b[^ab] Any character except a and b[0-9] All Digit[A-Z] All uppercase A to Z letters[a-z] All lowercase a to z letters...
[:lower:] lowercase letter islower [:print:] printable character isprint [:punct:] punctuation mark character ispunct [:space:] whitespace character isspace [:upper:] uppercase letter isupper [:xdigit:] hexadecimal digit character isxdigit [:d:] decimal digit character isdigit [:w:] word charact...
Match a single character present in the list below [[:lower:]] {2}matches the previous token exactly2times [:lower:]matches a lowercase letter[a-z] Positive Lookahead (?=.*[[:upper:]]) Assert that the Regex below matches . matches any character (except for line terminators) ...
It uses the RegexOptions.IgnoreCase option to ensure that the regular expression locates words beginning with both an uppercase "a" and a lowercase "a". C# Copy Run using System; using System.Text.RegularExpressions; namespace Examples { public class Example2 { public static void Main() { ...