The first pattern defines the case-insensitive option in a grouping construct that applies only to the letter "t" in the string "the". Because the option construct occurs at the beginning of the pattern, the second pattern applies the case-insensitive option to the entire regular expression....
However, the System.Text.RegularExpressions.RegexOptions property does not reflect inline options in the regular expression pattern itself. The following example provides an illustration. It uses the options parameter of the Regex.Match(String, String, RegexOptions) method to enable case-insensitive ...
NSString *regex = @"#([\\s\\S]*?)#"; NSRegularExpression *reg = [NSRegularExpression regularExpressionWithPattern:matchRegex options:NSRegularExpressionCaseInsensitive error:&error]; NSArray *match = [reg matchesInString:str options:NSMatchingReportCompletion range:NSMakeRange(0, [str length])...
ck@mintp ~ $shopt -s nocasematch; if [[ "linux" =~ "$var" ]]; then echo "yes"; else echo "no"; fi yes The condition now finally returns "yes" because acase insensitive regular expressionmatches. POSIX regular expression matching But Bash can do even more than that; it can also ...
5 QRegularExpression 5.1 模式字符串 5.2 设置模式 1 应用 1验证:测试一个子字符串是否是符合一些规范。(例如:是否是一个整数或者不包含任何空格) 2 搜索:提供了比简单的子字符串匹配更加强大的匹配模式。(例如,匹配单词mail或者letter,而不匹配email、mailman或者let...
NSRegularExpressionCaseInsensitive = 1 << 0, // 不区分大小写的 NSRegularExpressionAllowCommentsAndWhitespace = 1 << 1, // 忽略空格和# - NSRegularExpressionIgnoreMetacharacters = 1 << 2, // 整体化 NSRegularExpressionDotMatchesLineSeparators = 1 << 3, // 匹配任何字符,包括行分隔符 ...
NSRegularExpression的使用示例 下面是NSRegularExpression类的一系列示例,这些例子使用 \b(a|b)(c|d)\b的正则表达式来作为他们的正则表达式。 这段代码创建了一个正则表达式来匹配两个字符的单词,其首字母是“a”或者“b”,第二个字母是“c”或者“d”。指定NSRegularExpressionCaseInsensitive意味着,匹配是不区分...
re.DEBUGMethod. Returns debug information about the compiled expression. re.Iorre.IGNORECASEProperty. When specified, case-insensitive matching is performed. For example,[A-Z]will match lowercase letters. re.Lorre.LOCALEProperty. When specified,\w,\W,\b,\B,\sand\Sdepend on the current locale....
Regex options: Case insensitive Regex flavors: .NET, Java, PCRE, Perl, Python, Ruby Simple, with all characters This regular expression expands the previous one by allowing a larger set of rarely used characters in the username. Not all email software can handle all these characters, but we’...
$has a special meaning when it's the last character of a regular expression. An ordinary character matches the same character in the target sequence. By default, this means that the match succeeds if the two characters are represented by the same value. In a case-insensitive match, two char...