How to exclude some strings in C# Regex? -

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this current code:

        var formula = "scan: \"sample.test\" or 'batch.id' , if (results.tune)))";         if (formula.indexof("field(", stringcomparison.ordinalignorecase) == -1)         {             formula = regex.replace(formula, "[a-za-z]\\w+\\.[a-za-z_]\\w*", "field(\"$0\")");         }

the output looks like:

"scan: \"field(\"sample.test\")\" or 'field(\"batch.id\")' , if (field(\"results.tune\"))))"

however, i'd skip first 2 matches. so, if term quoted, not replace it. expected output should like:

"scan: \"sample.test\" or 'batch.id' , if (field(\"results.tune\"))))"

i managed expected result using 2 passes:

        var formula = "scan: \"sample.test\" or 'batch.id' , if (results.tune)))";         if (formula.indexof("field(", stringcomparison.ordinalignorecase) == -1)         {             formula = regex.replace(formula, "[a-za-z]\\w+\\.[a-za-z_]\\w*", "field(\"$0\")");             formula = regex.replace(formula, "([\"|'])field\\(\"([a-za-z]\\w+\\.[a-za-z_]\\w*)\"\\)\\1", "$1$2$1");         }

however, believe should possible make in 1 pass, possibly using regex exclude feature, couldn't figure out how.

you can perhaps use negative lookarounds , word boundaries help:

(?<![""'])\b[a-za-z]\w+\.[a-za-z_]\w*\b(?![""'])

also, can use @ avoid having double escape lot of things:

formula = regex.replace(formula, @"(?<![""'])\b[a-za-z]\w+\.[a-za-z_]\w*\b(?![""'])", "field(\"$0\")");

(?<![""']) negative lookbehind, makes sure character before first match isn't quote.

(?![""']) negative lookahead, little similar lookbehind, except checks following character.


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