字符串操作使用正則表達式

Question

我有一個字符串可以說C1 AND C2 OR C3 (~!@#$%) AND C4 OR C5 ，說我的輸入C3 然後我想刪除的垃圾/使用正則表達式C3和未來運營商之間AND|OR數據。

因此，對於上面的字符串，我想作爲C1 AND C2 OR C3 AND C4 OR C5

Answer 1

輸出試試這個：

var str = 'C1 AND C2 OR C3 (~!@#$%) AND C4 OR C5' 
var input = 'C3' 
console.log(str.replace(new RegExp("(" + input + ").*?(AND|OR)"), "$1$2")) 

Answer 2

function purgeJunk(variable, expression) { 
    return expression.replace(purgeJunk.regexp, function(match, digits, operator) { 
     if (digits != variable) return match; 
     return "C" + digits + " " + operator; 
    }); 
}; 

function purgeAllJunk(expression) { 
    return expression.replace(purgeJunk.regexp, function(match, digits, operator) { 
     return "C" + digits + " " + operator; 
    }); 
}; 

purgeJunk.regexp = /C(\d+) .*?(AND|OR)/g; 

// delete junk after C2 
purgeJunk(2, "C1 AND C2 OR C3 (~!@#$%) AND C4 OR C5") 
    == "C1 AND C2 OR C3 (~!@#$%) AND C4 OR C5" 

// delete junk after C3 
purgeJunk(3, "C1 AND C2 OR C3 (~!@#$%) AND C4 OR C5") 
    == "C1 AND C2 OR C3 AND C4 OR C5" 

// delete all junk 
purgeAllJunk("C1 # AND C2 OR C3 ~!@#$%()()()() ### AND C4 more garbage OR C5") 
    == "C1 AND C2 OR C3 AND C4 OR C5"