The probability of picking the maximum length is very low

[vlsi]

Sample regex: [-_a-zA-Z0-9].
random(1, 70) produces the following strings:

CY
6--Y-
0I-_-R
f
O
--A77_
-
_-V
05F-43-4-
f-2-QF_w
d_-
_0
_P
762_
_
_i_t__
Y
-b
-1i
5_J
X_S
_t-
9
p8-_yqHp4-
-
H_u
_
HW
_J-S-

Almost all the strings are short which is not always good.

Current code picks the value with probability of 66%
That makes it quite impossible to produce 70 chars for random(minLength=1, maxLength=70) because Generex would try to stop at each string with probability of 66%.

What if Generex had a mode where it stops as soon as the length exceeds given minLength?
Then random(minLength, maxLength) would be pick a random V1 between min...max, and then generate a string and stop as soon as the length exceeds V1.