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^
[
A-Z
0-9
._
%
-
]
+
@
[
A-Z
0-9
.
-
]
+
\.
[A-Z]
{2,4}
$
Options: case insensitive
Assert position at the start of the string
Match a single character present in the list below
Between one and unlimited times, as many times as possible, giving back as needed (greedy)
A character in the range between "A" and "Z"
A character in the range between "0" and "9"
One of the characters "._"
The character "%"
The character "-"
Match the character "@" literally
Match a single character present in the list below
Between one and unlimited times, as many times as possible, giving back as needed (greedy)
A character in the range between "A" and "Z"
A character in the range between "0" and "9"
The character "."
The character "-"
Match the character "." literally
Match a single character in the range between "A" and "Z"
Between 2 and 4 times, as many times as possible, giving back as needed (greedy)
Assert position at the end of the string (or before the line break at the end of the string, if any)
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