패턴3 - ^ : 줄 시작 , $ : 줄 끝 Source who is who Case 1 - 줄 시작 부분에 있는 who 찾기 Regular Expression: ^who First match: who is who All matches: who is who Case 2 - 줄 끝 부분에 있는 whot 찾기 Regular Expression: who$ First match: who is who All matches: who is who
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