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search()
search() 메서드는 문자열(정규식)을 검색하고 위치값(숫자)를 반환합니다.
"문자열".search("검색값")
"문자열".search(정규식 표현)
const str1 = "javascript reference";
const currentStr1 = str1.search("javascript"); //0
const currentStr2 = str1.search("reference"); //11
const currentStr3 = str1.search("j"); //0
const currentStr4 = str1.search("a"); //1
const currentStr5 = str1.search("v"); //2
const currentStr6 = str1.search("jquery"); //-1
const currentStr7 = str1.search("b"); //-1
const currentStr8 = str1.search(/[a-z]/g); //0
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