R:如何将条件列中的字符串替换为第二列？

var conditionColumn = "条件列";
var replaceColumn = "第二列";
var str = "需要替换的字符串";

var replacedStr = str.replace(conditionColumn, replaceColumn);
console.log(replacedStr);

import re

condition_column = "条件列"
replace_column = "第二列"
string = "需要替换的字符串"

replaced_string = re.sub(condition_column, replace_column, string)
print(replaced_string)

UPDATE 表名 SET 字段名 = REPLACE(字段名, '条件列', '第二列');

condition_column="条件列"
replace_column="第二列"
string="需要替换的字符串"

replaced_string=$(echo "$string" | sed "s/$condition_column/$replace_column/g")
echo "$replaced_string"