CODEWITHSUNDEEP
javascriptjquery
extraRice
extraRice

Reputation: 333

Replace a part of the string after being found in the text of an array element

I would like the fText string value int b=3, a, c=10; be changed into: 

int _sc_b=3, _sc_a, _sc_c=10;

by using the text inside the array elements.

My code:

var fText = "int b=3, a, c=10;";

sc_var_int_temp[0] = "a";
sc_var_int_temp[1] = "b";
sc_var_int_temp[2] = "c";


for( var vi=0; vi<sc_var_int_temp.length; vi++ ){
    //how would i do the replacing?
}//for

GOAL: fText value will be int _sc_b=3, _sc_a, _sc_c=10;

UPDATE: tried fText.replace(sc_var_int_temp[vi], "_sc_"+sc_var_int_temp[vi] ); but hangs the system ^^

as much as possible, i intend to do the replacing using the loop

UPDATE

I realized that the answer i accepted will not work properly when fText is: 

var fText = "int b=3,a ,c=10;";
//not really seperated by a single whitespace

Upvotes: 1

Views: 98

Answers (2)

pawel
pawel

Reputation: 36965

It possibly won't catch every edge case, but works with your example input/output:

for( var vi=0; vi<sc_var_int_temp.length; vi++ ){
    fText = fText.split(' '+ sc_var_int_temp[vi] ).join( " _sc_" + sc_var_int_temp[vi] );
}

http://jsfiddle.net/6YgHj/

Or without the loop

fText = fText.split(' ').join(' _sc_');

http://jsfiddle.net/6YgHj/1/

So what you really want is to add a prefix to what seems like variable names in a string that declares the variables. You need a way to extract the variable names. I can't think of every possible way to declare variables in your source language. Is "int a=1, float b,c" valid? How about "int a=10, b=2*a;"?

Upvotes: 4

ced-b
ced-b

Reputation: 4065

Try the following regexp:

var fText = "int b=3, a, c=10;";
fText = fText.replace(/(a|b|c)/g, "_sc_$1")

/(a|b|c)/g matches either a, b or c and assigns them as a separate match, because of the parens (). Then "_sc_$1" is the replacement whereby $1 pulls back the letter that was actually matched.

See the working fiddle here: http://jsfiddle.net/Kc2NF/

Upvotes: 0

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