Any Character The dot . in regular expressions is a powerful tool that matches any character except for newline characters. It's often used when the specific character is not important, or when matching a wide range of characters. @startregex title anyCharacter . @endregex Special Escapes ...
For example, 'n' matches the character "n". '\n' matches a newline character. The sequence '\\' matches "\" and "\(" matches "(". ^ Matches the position at the beginning of the input string. If the RegExp object's Multiline property is set, ^ also matches the position ...
A regular expression is a sequence of characters that act as a pattern for matching and manipulating strings. Regular expressions are used in the fn:matches, fn:replace, and fn:tokenize functions.
It is necessary to double backslashes in string literals that represent regular expressions. The string literal"\b", for example, matches a single backspace character when interpreted as a regular expression, while"\\b"matches a word boundary. The string literal"\(hello\)"is illegal and leads...
\S Any non-whitespace character (equivalent to [^ \t\n\r\f\v]) \w Any alphanumeric character (equivalent to [a-zA-Z0-9_]) \W Any non-alphanumeric character (equivalent to [^a-zA-Z0-9_]) \t The tab character \n The newline character分类...
.Matches any single character except the newline (\n) character. *Matches the preceding character zero or more times. You can also use a question mark (?). Example"zo*" matches either "z" or "zoo". The expression "a?ve?" matches the "ve" in "never". ...
\t, \n, \r -- tab, newline, return \d -- decimal digit [0-9] ^ = start, $ = end -- match the start or end of the string \ -- inhibit the "specialness" of a character. So, for example, use \. to match a period or \\ to match a slash. If you are unsure if a ...
Regular expression metacharacter syntax Subexpression Matches Notes General \^ Start of line/string $ End of line/string \b Word boundary \B Not a word boundary \A Beginning of entire string \z End of entire string \Z End of entire string (except allowable final line terminator) See ...
Matches the preceding character zero or one time. For example,a?ve?matches theveinnever. . Matches any single character except a newline character. (subexpression) Matchessubexpressionand remembers the match. If a part of a regular expression is enclosed in parentheses, that part of the regular...
A regular expression(简写成RegEx) defines a search pattern for strings. 正则表达式在文本的搜索编辑的场景中很有用处。 RegEx并不是Java发明的,可以说很久很久以前就出现了。1950年代,美国数学家Stephen Cole Kleene提出,后来随着Unix普及开。它从左往右逐个字符扫描文本,找到匹配的模式,继续往下扫描,模式可以使用...