表示 0 次或 1 次匹配。 转义字符(Escape Characters):使用反斜杠 \ 将特殊字符转义。例如,\d 表示匹配任何一个数字字符。 Java的正则表达式API Java提供了java.util.regex包来支持正则表达式操作。主要使用的类是Pattern和Matcher。 Pattern类:表示编译后的正则表达式模式,通过调用Pattern.compile()方法来创建一个Pa...
importjava.util.regex.*;publicclassEscapeCharacterMatcher{publicstaticbooleanmatchEscapeCharacter(Stringinput){Stringpattern="\\\.";// 匹配转义字符的正则表达式returnPattern.matches(pattern,input);}publicstaticvoidmain(String[]args){String[]inputs={"\\n","\\t","\\\"","\\\"};for(Stringinput:...
The regex “escape” character is the backslash. Preceding a metacharacter like . with this escape turns off its special meaning, so we look for a literal period rather than “any character.” Preceding a few selected alphabetic characters (e.g., n, r, t, s, w) with escape turns them...
\e The escape character ('\u001B')(转义字符) \cx The control character corresponding to x(控制字符) Character classes [abc] a, b, or c (simple class)(单一字符a或b或c) [^abc] Any character except a, b, or c (negation)(除abc以外的字符) [a-zA-Z] a through z or A through ...
“vertical-align:top; font-weight:normal” id=“escape”>\e escape character ('\u001B')\cx</th<>td headers=“matches characters ctrl_x”>与 x<对应的控制字符> Character classes [abc]a, bor (simple class)<
JAVA中也有个类java.util.regex.Pattern实现正则表达式, 下面是引用jdk5的api说明: Summary of regular-expression constructs Construct Matches Characters x The character x // The backslash character /0n The character with octal value 0n (0 <= n <= 7) ...
is a character class, which contains all the characters. Particularly useful, but remember to escape it when you need to match the actual dot characterBack to top Java Regex Boundary Matchers Next, there's syntax to specify the position of the matched sequence in the original text you're ...
When this flag is specified then the input string that specifies the pattern is treated as a sequence of literal characters. Metacharacters or escape sequences in the input sequence will be given no special meaning. The flags CASE_INSENSITIVE and UNICODE_CASE retain their impact on matching when...
Escape character. Necessary if you want to match to a period (.), bracket ([), brace (() or other special character. \n New-line character. \r Carriage-return character. [] Used to delimit a set of characters. * Zero or more occurrences of the previous character or set of characters...
Escape characters for text appearing in HTML markup. <P>This method exists as a defence against Cross Site Scripting (XSS) hacks. The idea is to neutralize control characters commonly used by scripts, such that they will not be executed by the browser. This is done by replacing the control...