July 2017
Beginner to intermediate
464 pages
10h 38m
Korean
Content preview from 러닝 자바스크립트: ES6로 제대로 입문하는 모던 자바스크립트 웹 개발
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343
17
장
정규표현식
17.2
정규식 만들기
복잡한 정규식 메타 언어를 공부하기 전에 먼저 자바스크립트에서 정규식을 어떻게 만들고 사
용하는지부터 알아봅시다. 바로 앞 예제처럼 특정 문자열을 검색하는 것부터 시작합시다. 소
잡는 칼로 닭 잡는 격이 되겠지만, 정규식을 좀 더 쉽게 이해할 수 있을 겁니다.
자바스크립트의 정규식은
RegExp
클래스입니다.
RegExp
생성자로도 정규식을 만들 수 있지만
간편한 리터럴 문법도 있습니다. 정규식 리터럴은 슬래시로 감싼 형태입니다.
const
re1
= /
going
/; // 단어 "
going
"을 찾을 수 있는 정규식
const
re2
=
new
RegExp
("
going
"); // 생성자를 사용했지만 결과는 같습니다.
RegExp
생성자를 써야 할 때가 있는데, 그 경우는 이 장 후반에서 알아볼 겁니다. 그런 특수한
경우를 제외하면 더 간편한 리터럴 문법을 써야 합니다.
17.3
정규식 검색
정규식이 만들어지면 다양한 옵션으로 문자열을 검색할 수 있습니다.
정규식의 문자열 교체 옵션에 대해 이해하려면 정규식 메타 언어에 대해 좀 알아야 하는데, 정
적인 문자열을 예제로 사용한다면 좀 지루할 겁니다. 예제로 사용할 정규식은
/
\w
{
3
,}/
ig
입니
다. 이 정규식은 세 글자 이상인 단어에 모두 일치하고, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.