The first suggestion would be find out what expressions you want to support. Is it just the four basic arithmetic ops? What representations do you need of numbers (eg., base ten? Scientific notation like 8E6? Rationals? Arbitrary precision reals? Complex numbers?). Do you need precedence to work implicitly (eg., is "32 + 9/5 * x" "32 + ((9/5) * x)"? Or "((32 + 9)/5) * x"? Something else)? Do you need to allow arbitrary functions that you had defined earlier?
Depending on how simple your needs, you may be able to use a simple regular expression to do the parsing for you, or you may need something more involved.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
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horizontal scrolling (and possible janitor
intervention).
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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