As described earlier, many elements of a regular expression match a single character in a string. For example,\smatches a single character of whitespace. Other regular expression elements match the positions between characters, instead of actual characters.\b, for example, matches a word boundaryth...
but by default it does not go past the end of a line. Note that \s (whitespace) includes newlines, so if you want to match a run of whitespace that may include a newline, you can just use \s*
The simplest regular expression is a single literal character. Except for the metacharacters like*+?()|, characters match themselves. To match a metacharacter, escape it with a backslash. For example,\+matches the literal plus character.
Match any whitespace character \s Public\sInterface matches the phrase "Public Interface" Match any decimal digit character \d \d matches "4" and "0" in "wd40"An example regular expression that combines some of the operators and constructs to match a hexadecimal number is \b0[xX]([0-9a-...
Want to make queries case-insensitive? Add(?i)at the start of the expression. (?i)^(who|what|where|when|why|how)[" "] Match Branded Terms Often, people searches have spelling mistakes in them. You can properly evaluate brand searches with regular expressions. ...
The RegexOptions.IgnorePatternWhitespace option, or the x inline option, changes this default behavior as follows:Unescaped white space in the regular expression pattern is ignored. To be part of a regular expression pattern, white-space characters must be escaped (for example, as \s or "\ ")...
'a1\ ' -match '...' Whitespace You can match any whitespace character with the \s character class. You can match any non-whitespace character with \S. You can match literal space characters with . PowerShell Cóipeáil # This expression returns true. # The pattern uses the whitespace...
A regular expression in XPath syntax can be compiled in a normal and extended mode. In the extended mode, most unescaped whitespace (blanks and line breaks) of the pattern are ignored outside character classes and comments can be placed behind #. In ABAP built-in functions, the extended ...
For example, to create an instance of Regex that ignores case and pattern white space, and then retrieve the set of matches for that expression, you would use code like the following:Regex re = new Regex(pattern, RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace); MatchCollection mc ...
NSRegularExpression是正则表达式的专用类,其他的还有 1.NSString的:rangeOfString:option:是直接查找。 2.NSPredicate谓词匹配 enum { NSRegularExpressionCaseInsensitive = 1 << 0, // 不区分大小写的 NSRegularExpressionAllowCommentsAndWhitespace = 1 << 1, // 忽略空格和# - NSRegularExpressionIgnoreMetacharac...