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6. Please tell the differences between POXIS-Basic regular expressiorn and Extended regular expression. Then please list six special characters used in POXIS-Basic regular expression. And

6. Please tell the differences between POXIS-Basic regular expressiorn and Extended regular expression. Then please list six special characters used in POXIS-Basic regular expression. And please list ten special characters used in POXIS-Extended regular expression. 7. How to search a string using a basic regular expression in Vi editor? How about using extended regular expression in Vi editor

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