JavaScript RegExp 참조
정규 표현식 개체
정규식은 문자 패턴 입니다.
패턴은 텍스트에서 패턴 일치 "검색 및 바꾸기" 기능을 수행하는 데 사용됩니다.
JavaScript에서 RegExp 개체 는 속성 및 메서드 가 있는 패턴입니다 .
통사론
/pattern/modifier(s);
예시
let pattern = /w3schools/i;
설명된 예:
| w3schools | 검색할 패턴 |
|---|---|
| /w3학교/ | 정규식 |
| /w3학교/나 | 대소문자를 구분하지 않는 정규식 |
정규 표현식에 대한 튜토리얼은 JavaScript RegExp 튜토리얼 을 읽어보세요 .
브라우저 지원
/regexp/ ECMAScript1(ES1) 기능입니다.
ES1(JavaScript 1997)은 모든 브라우저에서 완벽하게 지원됩니다.
| Chrome | IE | Edge | Firefox | Safari | Opera |
| Yes | Yes | Yes | Yes | Yes | Yes |
수정자
수정자는 대소문자를 구분하지 않고 전역 검색을 수행하는 데 사용됩니다.
| Modifier | Description |
|---|---|
| g | Perform a global match (find all matches rather than stopping after the first match) |
| i | Perform case-insensitive matching |
| m | Perform multiline matching |
괄호
대괄호는 문자 범위를 찾는 데 사용됩니다.
| Expression | Description |
|---|---|
| [abc] | Find any character between the brackets |
| [^abc] | Find any character NOT between the brackets |
| [0-9] | Find any character between the brackets (any digit) |
| [^0-9] | Find any character NOT between the brackets (any non-digit) |
| (x|y) | Find any of the alternatives specified |
메타 문자
메타 문자는 특별한 의미를 가진 문자입니다.
| Metacharacter | Description |
|---|---|
| . | Find a single character, except newline or line terminator |
| \w | Find a word character |
| \W | Find a non-word character |
| \d | Find a digit |
| \D | Find a non-digit character |
| \s | Find a whitespace character |
| \S | Find a non-whitespace character |
| \b | Find a match at the beginning/end of a word, beginning like this: \bHI, end like this: HI\b |
| \B | Find a match, but not at the beginning/end of a word |
| \0 | Find a NULL character |
| \n | Find a new line character |
| \f | Find a form feed character |
| \r | Find a carriage return character |
| \t | Find a tab character |
| \v | Find a vertical tab character |
| \xxx | Find the character specified by an octal number xxx |
| \xdd | Find the character specified by a hexadecimal number dd |
| \udddd | Find the Unicode character specified by a hexadecimal number dddd |
수량자
| Quantifier | Description |
|---|---|
| n+ | Matches any string that contains at least one n |
| n* | Matches any string that contains zero or more occurrences of n |
| n? | Matches any string that contains zero or one occurrences of n |
| n{X} | Matches any string that contains a sequence of X n's |
| n{X,Y} | Matches any string that contains a sequence of X to Y n's |
| n{X,} | Matches any string that contains a sequence of at least X n's |
| n$ | Matches any string with n at the end of it |
| ^n | Matches any string with n at the beginning of it |
| ?=n | Matches any string that is followed by a specific string n |
| ?!n | Matches any string that is not followed by a specific string n |
RegExp 개체 속성
| Property | Description |
|---|---|
| constructor | Returns the function that created the RegExp object's prototype |
| global | Checks whether the "g" modifier is set |
| ignoreCase | Checks whether the "i" modifier is set |
| lastIndex | Specifies the index at which to start the next match |
| multiline | Checks whether the "m" modifier is set |
| source | Returns the text of the RegExp pattern |
RegExp 개체 메서드
| Method | Description |
|---|---|
| compile() | Deprecated in version 1.5. Compiles a regular expression |
| exec() | Tests for a match in a string. Returns the first match |
| test() | Tests for a match in a string. Returns true or false |
| toString() | Returns the string value of the regular expression |