I have some values like 10++10--10+-10-+.my question is how to replace these value into matched value using single reg expression.i need a answer like 10+10-10-10-.
its means
'++'='+',
'--'='-',
'+-'='-',
'-+'='-';
.please help me for solve my problem.
Match and capture the alternatives you need to replace with a specific string, and then use the replace callback to see which group matched and replace accordingly:
var s = '10++10--10+-10-+';
document.body.innerHTML = s.replace(/(\+\+)|([-+]-|-\+)/g, function(m, g1, g2) {
return g1? "+" : "-";
});The (\+\+)|([-+]-|-\+) regex contains 2 alternative groups since there are 2 replacement patterns. Group 1 (\+\+) will match double pluses while Group 2 - ([-+]-|-\+) - matches and captures --, +- and -+.
A solution that is Regex only without callback function, so that it can be applicable in other languages that do not have regex replacement callbacks.
var s = '10++10--10+-10-+';
document.body.innerHTML = (s + "||||++=>+,+-=>-,-+=>-,--=>-" // Append replacements
).replace(/(\+\+|--|-\+|\+-)(?=[\s\S]*\1=>([^,]*))|\|\|\|\|[\s\S]*$/g, "$2"
// Perform replacements and remove replacements
)
--++? will there be any such value'--'='+'?'10++10--10+-10-+'.replace(/(\+\+)|([-+]-|-\+)/g, function(m,g1,g2){return g1?"+":"-";});