| 1 | #!/bin/sh
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| 2 |
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| 3 | # Continuing off of regex
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| 4 | #
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| 5 | # [] matches with any one character from inside the brackets
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| 6 | # [^] matches with any that are not in the brackets
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| 7 | #
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| 8 | # () groups parts of a pattern
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| 9 | #
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| 10 | # {} repeats what was shown before a certain amount of times
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| 11 | # [a-zA-Z]{2,} All alphabet characters (lower and uppercase)
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| 12 | # should be used 2 or more times
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| 13 | # [a-zA-Z0-9]{5,15} All characters in square brackets should be used
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| 14 | # a min of 5 times and max of 15
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| 15 | #
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| 16 | # `` same as $(...), but $() is preferred
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| 17 | # \ backslash for the literal character
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| 18 | #
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| 19 |
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| 20 | # We will verify valid email addresses below. We will keep it simple to
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| 21 | # addresses with one word beginnings with numbers and letters, @,
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| 22 | # and a website domain.
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| 23 | # billybob@bob1.com, David2@test.xyz, etc
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| 24 |
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| 25 | verify() {
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| 26 | # don't forget the + symbol in some of these regex
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| 27 |
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| 28 | # verify that the beginning has valid characters
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| 29 | echo "$1" | grep -Eq || exit 1
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| 30 |
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| 31 | # verify that an @ symbol and a second level domain is present with
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| 32 | # only letters and numbers
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| 33 | echo "$1" | grep -Eq || exit 1
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| 34 |
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| 35 | # verify a dot is present
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| 36 | echo "$1" | grep -Eq || exit 1
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| 37 |
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| 38 | # verify the ending is a top level domain with 2 or more lowercase
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| 39 | # characters
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| 40 | echo "$1" | grep -Eq || exit 1
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| 41 | }
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| 42 |
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| 43 | verify $1
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| 44 | exit 0
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