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Regular Expression
(?<id>[A-Za-z_][0-9A-Za-z_]*) (?<op>\=) (?: (?> (?: (?<= ((\.[0-9]+|[0-9]+(\.[0-9]+)?)([eE][-+][0-9]+)?|[0-9]+) | [A-Za-z_][0-9A-Za-z_]* | \) ) (?<op> \+ | \* ) ( ?= ((\.[0-9]+|[0-9]+(\.[0-9]+)?)([eE][-+][0-9]+)?|[0-9]+) | [A-Za-z_][0-9A-Za-z_]* | $ ) ) | ( ?<parenthesis> ( ?<= \= | \+ | \* | \( ) (?<op>\() ( ?= ((\.[0-9]+|[0-9]+(\.[0-9]+)?)([eE][-+][0-9]+)?|[0-9]+) | [A-Za-z_][0-9A-Za-z_]* | \( ) ) | ( ?<-parenthesis> ( ?<= ((\.[0-9]+|[0-9]+(\.[0-9]+)?)([eE][-+][0-9]+)?|[0-9]+) | [A-Za-z_][0-9A-Za-z_]* | $ ) (?<op>\)) (?! ((\.[0-9]+|[0-9]+(\.[0-9]+)?)([eE][-+][0-9]+)?|[0-9]+) | [A-Za-z_][0-9A-Za-z_]* ) ) | (?: (?<= \= | $ | \+ | \* ) (?: (?<const>(\.[0-9]+|[0-9]+(\.[0-9]+)?)([eE][-+][0-9]+)?|[0-9]+) | (?<id>[A-Za-z_][0-9A-Za-z_]*) ) ( ?=$ | $ | \+ | \* ) ) )+ ( ? ( parenthesis ) (?!) ) )$

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