Ruby supports regular expression quite well, so it's not surprising that one can use a lookaround to match a specific position. That also works really well with String#split, so if one needs to extract the key/value out of a string such as this:
s = "TYPE=Exterior RED=119 GREEN=105 BLUE=88 TABLEREQ=PNTTBL-01 TABLE=Primary w/XL GENERICCLR=Beige GENERICCLRCODE=31"
this will do nicely:
s.split(/\s(?=[A-Z]*=)/)
Just splitting on "space" won't work because there are spaces inside the values, too ("Primary w/XML").
Simple and useful...