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Top Forums Shell Programming and Scripting A Perl regexp to validate arithmetic expressions Post 302477841 by DGPickett on Monday 6th of December 2010 01:24:50 PM
Old 12-06-2010
# Valid arifmetic expressions
'+3',
'-(3/4+(-2-3)/3)',
'(-((3)))',
'-(+1+2)*(3/(1-2))/((-3))',
'2*-3',
# Invalid (from the point of view of a human) arifmetic expressions
'-(3/4+(-2-3)/3',
'(-((3)+))');
 

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shevek::regexp(3)					     Library Functions Manual						 shevek::regexp(3)

NAME
shevek::regexp - Use regular expressions. SYNOPSIS
#include <regexp.hh> Public Member Functions regexp (std::string const &pattern=std::string(), bool case_sensitive=false) Create a new object, and optionally fill it with a pattern. regexp & operator= (std::string const &pattern) Set a pattern, removing the previous one. regexp (regexp const &that) Copy a regexp. regexp & operator= (regexp const &that) Copy a regexp. void case_sensitive (bool value=true) Set whether the evaluation should be case sensitive. ~regexp () Destructor, this cleans up internal structures. bool operator() (std::string const &data) Check whether the pattern matches a string, and fill internal match structures if it does. std::string operator[] (unsigned idx) const Retrieve the value of a subexpression from the last matched string. bool valid (unsigned idx) const Test whether a subexpression was filled by the last matching string. unsigned size () const Get the number of subexpression. std::string transform (std::string const &data) const Transform a string with -codes according to the last matching string. std::string const & pattern () const Get the current pattern. Detailed Description Use regular expressions. Member Function Documentation std::string shevek::regexp::operator[] (unsignedidx) const Retrieve the value of a subexpression from the last matched string. This throws an exception if the subexpression is not valid. Author Generated automatically by Doxygen for libshevek from the source code. libshevek Fri May 11 2012 shevek::regexp(3)
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