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Support BSD sed and older bash in test rule. (#112)
BSD sed (as shipped with MacOS) does not support `+` nor `\+` in regular expressions. However it does support `\{1,\}` which does the same thing and is also supported by GNU sed. Moreover, bash 3.2 (as shipped with MacOS) does not seem to support `source <(...)`, it seems to just do nothing. Using plain eval seems to do the trick though.
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