Question

I have two questions.

1:

String = xx yy **

I want to remove “xx ” so String becomes = “yy *” (xx/yy is fixed and * can be anything)
I tried something like this but it does not work:

string.replaceall("^(xx )$", "");

Isn’t this supposed to replace the first occurence of “xx ” with “” ?

SOLVED(by Lucas)

2:

String = xx yy **

I want to remove ” yy **” so that String becomes = “xx”
I thought something like this, but since the first doesnt work i suspoect this will not too.

string.replaceall("^( yy)*$", "");

UNSOLVED

I actually phrased this one insufficiently,

xx should be **

so xx is not fixed

** yy **
should become ** which is the first **

Answer 1

Try this for the question1:

string.replaceFirst("^xx ", "");

for the second one:

string.replaceFirst(" yy .*$", "");

EDIT:
if regex is not a must, we can use this for the second one:

string.substring(0, string.indexOf(" yy");

EDIT2: If ‘\n’ will be included in the string, this works for the second one:

string.replaceFirst(" yy [\\w\\W]*$", "");