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Answers and rating deltas for

What does this regular expression mean /^[a-z]{1}[a-z0-9_]{3,13}$/

Author Votes Δ
zx81 5 +1.13
Avinash Raj 0 -0.35
Myrtle 0 -0.46
rvalvik 0 -0.99
Thomas Junk 0 -0.09
Harpreet Singh 0 -0.79
Last visited: May 1, 2015, 7:54:18 PM