Summing values from a rage containing numerical and textual substring

I have an excel file there quantity I added with date like 09/05/2009=05 and 10/05/2009=05 as on. Each date and quantity added on each column. I want to sum the quantity.

Example 5/12=2, 6/12=30, 7/12=5, 8/12=30, 9/12=30, 16/12=30

More clearly

I would want to be able to sum a range of cells that contain text like 5/12=2, 6/12=30, 7/12=5, 8/12=30, 9/12=30, and 16/12=30. And in the instant case the value you would want to arrive at with these text strings would be 127 = (2 + 30 + 5 + 30 + 30 + 30).

Is there any way to sum this quantity without date?

I got this formula

=SUM(IF(ISNUMBER(FIND(C2,B2:B5)),VALUE(LEFT(B2:B5,FIND(C2,B2:B5)-1)),0))

but its not working as it is.Going by the narrative, rather than the formula:

=SUMPRODUCT(VALUE(MID(B2:B5,FIND("=",B2:B5)+1,999)))

Please paste in a copy of the actual range if that's not what you want.

=SUMPRODUCT(VALUE(MID(B2:B5,FIND("=",B2:B5)+1,999)))

Please paste in a copy of the actual range if that's not what you want.

Thank you.