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POcustom regular expression parser
 

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  1. POcustom regular expression parser
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    <p>i would like to do regular expression matching on custom alphabets, using custom commands. the purpose is to investigate equations and expressions that appear in meteorology.</p> <p>So for example my alpabet an be <code>[p, rho, u, v, w, x, y, z, g, f, phi, t, T, +, -, /]</code> NOTE: the rho and phi are multiple characters, that should be treated as single character.</p> <p>I would also like to use custom commands, such a <code>\v</code> for variable, i.e. not the arithmatic operators.</p> <p>I would like to use other commands such as <code>(\v).</code> <em>note the dot</em> should match <code>dx/dt</code>, where <code>x</code> is a variable. similarly, given <code>p=p(x,y,z)</code>, <code>p'</code> would match <code>dp/dx</code>, <code>dp/dy</code>, and <code>dp/dz</code>, but not <code>dp/df</code>. (somewhere there would be given that <code>p = p(x,y,z)</code>).</p> <p>I would also like to be able to backtrack.</p> <p>Now, i have investigated PCRE and ragel with D, i see that the first two problems are solvable, with multiple character objects defined s fixed objects. and not a character class.</p> <p>However how do I address the third?</p> <p>I dont see either PCRE or RAGEL admitting a way to use custom commands. Moreover, since I would like to use backtrack I am not sure if Ragel is the correct option, as this wouuld need a stack, which means I would be using CFG.</p> <p>Is there <em>perhaps</em> a domainspeific language to build such regex/cfg machines (for linux 64 bit if that matters)</p>
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    1. COWhat's the third problem ? It's confusing what you want ... Could you post an input and expected output ?
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    2. COthird prblem: I would like to use other commands such as (\v). note the dot should match dx/dt, where x is a variable. similarly, given p=p(x,y,z) , p' would match dp/dx, dp/dy, and dp/dz, but not dp/df. (soomewhere there would be given that p = p(x,y,z).so string[] test= ["dp/df", "dp/dx"]; char[] p_depends = ['x','y','z']; are given, now: regexmatch(test, "p'", p_depends) should return "dp/dx". note the prime (') with p in the 2nd arg specifying the pattern
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      1. USSean
 

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