^((<|>)?=?)s*(\s*[v=]*\s*([0-9]+)\.([0-9]+)\.([0-9]+)(-[0-9]+-?)?([a-zA-Z-+][a-zA-Z0-9-.:]*)?)$|^$
>=0.6.0-,>=,>,0.6.0-,0,6,0,,-
=0.6.0-,=,,0.6.0-,0,6,0,,-
0.6.0-,,,0.6.0-,0,6,0,,-
<=0.6.0-,<=,<,0.6.0-,0,6,0,,-
>=0.6.0-a:b-c.d,>=,>,0.6.0-a:b-c.d,0,6,0,,-a:b-c.d
=0.6.0-a:b-c.d,=,,0.6.0-a:b-c.d,0,6,0,,-a:b-c.d
0.6.0+a:b-c.d,,,0.6.0+a:b-c.d,0,6,0,,+a:b-c.d
<=0.6.0+a:b-c.d,<=,<,0.6.0+a:b-c.d,0,6,0,,+a:b-c.d
a
b
y
z
B
Y
Z
-
+