Sounds like you want a math regex to match parts of equations. That would be seriously sweet.
Given how glacially mathml and friends are moving though I can't imagine we'll see something like that any time soon. Maybe microformats could be applied to maths expressions and then search using semantic web tools?
Posted May 11, 2011 12:29 UTC (Wed) by nix (subscriber, #2304)
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TBH regexes applied to TeX seem more likely to bear fruit. It's not like people who write equations professionally would like to use MathML instead of TeX.