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1418.Regular expression replace -- How to keep all lines with 6 letters or numbers and at most 2 letter?

User: jiangnan -- 2018-07-20          << 1417  1419 >>
Hits: 646
Type: Regular expression replace   
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Description:
How to keep all lines match 6 chars with letter or number,and at most 2 letter?
Input Sample:
abc123
ab1234
ab12345
a1234b
1234ab
ab123
a12345
Output Sample:
ab1234
a1234b
1234ab
a12345
Answer:
Hint: You need to Download and install "Replace Pioneer" on windows platform to finish following steps.
1. ctrl-o open source file
2. ctrl-h open 'replace' dialog
* set 'replace unit' to 'Line'
* set 'if' to:

3. click 'replace', done.

Screenshot 1:  Replace_Window


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