Regular Expression Metacharacters

 

 

Metacharacters	Meaning	Examples
\	Indicates that the match character is a special character, a literal, or a backreference. (A backreference repeats the previous match.)	\n matches the newline character \\ matches \ \( matches ( \) matches )
^	Matches the position at the start of the string.	^A matches A if A is the first character in the string.
$	Matches the position at the end of the string.	$B matches B if B is the last character in the string.
*	Matches the preceding character zero or more times.	ba*rk matches brk, bark, baark, and so on.
+	Matches the preceding character one or more times.	ba+rk matches bark, baark, and so on, but not brk.
?	Matches the preceding character zero or one time.	ba?rk matches brk and bark only.
{n}	Matches a character exactly n times, where n is an integer.	hob{2}it matches hobbit.
{n,m}	Matches a character at least n times and at most m times, where n and m are both integers.	hob{2,3}it matches hobbit and hobbbit only.
.	Matches any single character except null.	hob.it matches hobait, hobbit, and so on.
(pattern)	A subexpression that matches the specified pattern. You use subexpressions to build up complex regular expressions. You can access the individual matches, known as captures, from this type of subexpression.	anatom(y|ies) matches anatomy and anatomies.
x|y	Matches x or y, where x and y are one or more characters.	war|peace matches war or peace.
[abc]	Matches any of the enclosed characters.	[ab]bc matches abc and bbc.
[a-z]	Matches any character in the specified range.	[a-c]bc matches abc, bbc, and cbc.

 

 

[: :]	Specifies a character class and matches any character in that class.	[:alphanum:] matches alphanumeric characters 0-9, A-Z, and a-z. [:alpha:] matches alphabetic characters A-Z and a-z. [:blank:] matches space or tab. [:digit:] matches digits 0-9. [:graph:] matches non-blank characters. [:lower:] matches lowercase alphabetic characters a-z. [:print:] is similar to [:graph:] except [:print:] includes the space character. [:punct:] matches punctuation characters .,”‘, and so on. [:space:] matches all whitespace characters. [:upper:] matches all uppercase alphabetic characters A-Z. [:xdigit:] matches characters permissible in a hexadecimal number 0-9, A-F, and a-f.
[..]	Matches one collation element, like a multicharacter element.	No example.
[==]	Specifies equivalence classes.	No example.
\n	This is a backreference to an earlier capture, where n is a positive integer.	(.)\1 matches two consecutive identical characters. The (.) captures any single character except null, and the \1 repeats the capture, matching the same character again, therefore matching two consecutive identical characters.

 

 

정규식_Metacharacters_정리.doc

 

 

 

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