기본 연습 - 정규 표현식 연습 사이트
https://regexr.com/38bd56
정규 표현식(Regular Expression)
- 문자열을 검색하거나, 치환할 목적으로 고안된 특수한 문자열
[]
-
[] : Character set. Match any character in the set.
-
다음과 같이 범위로 지정할 수도 있다.
^
- set안에 쓰이면, not의 의미를 갖는다.
- ^ : Negated set. Match any character that is not in the set.
\w, \W
-
\w : Word. Matches any word character (alphanumeric & underscore).
-
\W : Not word. Matches any character that is not a word character (alphanumeric & underscore).
\d, \D
-
\d : Digit. Matches any digit character (0-9)
-
\D : Not digit. Matches any character that is not a digit chracter (0-9)
+
- '+' : Quantifier. Match 1 or more of the preceding token.
^, +
- ^ : Beginning. Matches the beginning of the string, or the beginning of a line, if the multiline flag is enabled.
- '+' : Quantifier. Match 1 or more of the preceding token.
.
- . : Dot. Mtaches any character except line breaks.
\s, \S
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\s : whitespace. Matches any whitespace character (spaces, tabs, line breaks)
-
\S : Not whitespace. Matches any character that is not a whitespace chracter (spaces, tabs, line breaks).
\b
- \b : Word boundary. Matches a word boundary position between a word character and non-word character or postion (start /end of string)
- ? : Lazy. Makes the preceding quantifier lazy, causing it to match as few characters as possible
안녕하세요.