===========================Example.txt==================================
Welcome to RegExr v2.1 by gskinner.com, proudly hosted by Media Temple!
Edit the Expression & Text to see matches. Roll over matches or the expression for details. Undo mistakes with ctrl-z. Save Favorites & Share expressions with friends or the Community. Explore your results with Tools. A full Reference & Help is available in the Library, or watch the video Tutorial.
Sample text for testing:
abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ
0123456789 _+-.,!@#$%^&*();\/|<>"'ㅜ
12345 -98.7 3.141 .6180 9,000 +42
555.123.4567 +1-(800)-555-2468
foo@demo.net bar.ba@test.co.uk
www.demo.com http://foo.co.uk/
http://regexr.com/foo.html?q=bar
https://mediatemple.net
/[0-9]/g : 숫자만 가져옴
/[a-z]/g : 소문자만 가져옴
/[A-Z]/g : 대문자만 가져옴
/[a-zA-Z]/g : 대소문자만 가져옴
/[0-9a-zA-Z]/g : 대소문 및 숫자만 가져옴
/[^0-9]/g : 숫자를 제외한 나머지
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