git/Documentation/line-range-format.txt

- number
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If <start> or <end> is a number, it specifies an
absolute line number (lines count from 1).
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- /regex/
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This form will use the first line matching the given
POSIX regex.  If <end> is a regex, it will search
starting at the line given by <start>.
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- +offset or -offset
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This is only valid for <end> and will specify a number
of lines before or after the line given by <start>.
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- :regex
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If the option's argument is of the form :regex, it denotes the range
from the first funcname line that matches <regex>, up to the next
funcname line.
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