I want to replace a lot of keywords in string with pre-defined variables, samples as below, but now $1 only shows variable name, not variable content, any one can help me, please!!!
Correct:
1111{t:aa}
2222{t:bb}
3333{t:cc}
To:
1111Test1
2222Test2
3333Test3
Not:
1111aa
2222bb
3333cc
Code:
var aa = "Test1";
var bb = "Test2";
var cc = "Test3";
var str_before = "1111{t:aa}\n2222{t:bb}\n3333{t:cc}";
var str_after = str_before.replace(/\{t:\s*(\w+)\}/g, "$1");
alert(str_before+"\n\n"+str_after);
A regexp constant (i.e. /.../ syntax) cannot directly refer to a variable.
An alternate solution would be to use the .replace function's callback parameter:
var map = {
aa: 'Test1',
bb: 'Test2',
cc: 'Test3'
};
var str_before = "1111{t:aa}\n2222{t:bb}\n3333{t:cc}";
var str_after = str_before.replace(/{t:(\w+)}/g, function(match, p1) {
return map.hasOwnProperty(p1) ? map[p1] : '';
});
This further has the advantage that your mapping from name to value is now easily configurable, without requiring a separately declared variable for each one.
There is a NPM package out there for this, it allows you to pass in the string, and an array of variables you want to replace them with. Find a simple example along with the link to the package below:
Example:
var str = "This is a {0} string for {1}"
var newStr = stringInject(str, ["test", "stringInject"]);
// This is a test string for stringInject
NPM / GitHub links:
