Replace a character in a specific URL parameter

Question

I'm trying to replace the / separator in the value of URL param1 parameter with \, but I can't figure how to do it without changing it for all parameters like param2

For example

param1=abc/def/123&param2=abc/def/123

I would like to become

param1=abc\def\123&param2=abc/def/123

Here is a regex101 example

Replace (param1=.+?)\/ with \1\\? regex101.com/r/2RRLKf/1 — 41686d6564
– 41686d6564, Commented Nov 6, 2019 at 20:02
@AhmedAbdelhameed I'm don't understand your solution. It only replaces the first slash, but not the second one and there could be mutiple ones. Here is the updated example — Ionut
– Ionut, Commented Nov 6, 2019 at 20:07
My bad, I thought you only wanted to replace the first one. What programming language or regex flavor are you using? — 41686d6564
– 41686d6564, Commented Nov 6, 2019 at 20:11
I will do this in Java 1.6, and I was wandering if I can avoid iterating the parameters and their values. — Ionut
– Ionut, Commented Nov 6, 2019 at 20:12

Pavel Lint · Accepted Answer · 2019-11-06 20:37:22Z

1

I would split this in 2 simple steps. First dig out "param1=..." substring with regexp, and then just replace "/" with "\" in it. Here's an example in JavaScript:

var str = "param1=qwe/qwe/wer&param2=qd/fs/aw";
var match = str.match(/^(.*)(param1=[a-z\/0-9_]+\b)(.*)$/);
var result = match[1] + match[2].replace(/\//g, "\\") + match[3];
console.log(str, result);

answered Nov 6, 2019 at 20:37

Pavel Lint

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