cat(gsub("(.)([0-9-]+)","\\1=\\2 ",c("w5x100y-20z-30","a1b7c19d32e87f54g34h19i2j75k25l46m63n23o18","x2y4")[sample(3,1)]))
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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