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On 11/26/2013 10:24 AM, John Cowan wrote:
Michael Montague scripsit:I don't think that these are strong arguments for having 'valid-sre?'. An implementation for which compiling is expensive, could easily internally do the "is it valid"-type check before compiling. Having it in the interface adds no functionality that is not already easily available.It tells the compiler only to syntax-check and not go on to actually compile. This is a very common feature in compilers: for example, in gcc the -fsyntax-only option activates this mode. Sometimes all you want to know at present is whether something is syntactically valid.
The only use case for 'valid-sre?' mentioned so far is Peter's interactive regular expression IDE. The C standard does not require the -fsyntax-only option. These do not seem like compelling arguments for including
'valid-sre?'.