RegexOne

http://regexone.com/

http://regexone.com/lesson/optional_characters?

http://regexone.com/lesson/capturing_groups

Task          Text                                      Capture Groups
Capture     file_record_transcript.pdf        file_record_transcript Success
Capture     file_07241999.pdf                  file_07241999 Success
Skip           testfile_fake.pdf.tmp

^(file.+)\.pdf

http://regexone.com/lesson/nested_groups?

Task Text Capture Groups
Capture Jan 1987 Jan 1987 1987
Capture May 1969 May 1969 1969
Capture Aug 2011 Aug 2011 2011

(\D+(\d+))

http://regexone.com/lesson/more_groups

1280x720  提取出1280 720

((\d+)\D(\d+))

http://regexone.com/lesson/conditionals

Task Text
Match I love cats
Match I love dogs
Skip I love logs
Skip I love cogs

I love (cats|dogs)

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