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Some character sets provide a separate newline character code. EBCDIC , for example, provides an NL character code in addition to the CR and LF codes. Unicode , in addition to providing the ASCII CR and LF control codes , also provides a "next line" ( NEL ) control code, as well as control codes for "line separator" and "paragraph separator ...
A regular expression (shortened as regex or regexp), [1] sometimes referred to as rational expression, [2] [3] is a sequence of characters that specifies a match pattern in text. ...
The C language defines whitespace characters to be "space, horizontal tab, new-line, vertical tab, and form-feed". [29] The HTTP network protocol requires different types of whitespace to be used in different parts of the protocol, such as: only the space character in the status line, CRLF at the end of a line, and "linear whitespace" in header ...
So the newline option can also be stated at the start of the pattern using one of the following: (*LF) Newline is a linefeed character. Corresponding linebreaks can be matched with \n. (*CR) Newline is a carriage return. Corresponding linebreaks can be matched with \r. (*CRLF) Newline/linebreak
Java Apache java.util.regex Java's User manual: Java GNU GPLv2 with Classpath exception jEdit: JRegex JRegex: Java BSD MATLAB: Regular Expressions: MATLAB Language: Proprietary Oniguruma: Kosako: C BSD Atom, Take Command Console, Tera Term, TextMate, Sublime Text, SubEthaEdit, EmEditor, jq, Ruby: Pattwo Stevesoft Java (compatible with Java 1.0 ...
re2c uses the following syntax for regular expressions: "foo" case-sensitive string literal 'foo' case-insensitive string literal [a-xyz], [^a-xyz] character class (possibly negated). any character except newline; R \ S difference of character classes; R* zero or more occurrences of R; R+ one or more occurrences of R; R? zero or one occurrence of R
The explicit reference for a single whitespace character is WSP (linear white space), and LWSP is for zero or more whitespace characters with newlines permitted. The LWSP definition in RFC5234 is controversial [4] because at least one whitespace character is needed to form a delimiter between two fields. Definitions are left-aligned.
A metacharacter is a character that has a special meaning to a computer program, such as a shell interpreter or a regular expression (regex) engine.. In POSIX extended regular expressions, there are 14 metacharacters that must be escaped — preceded by a backslash (\) — in order to drop their special meaning and be treated literally inside an expression: opening and closing square brackets ...