java-string unknown number of space to 1 space

strVariable.replace("source1","target1").replace("source2","target2");

*********************************************************
unknown  number of space to 1 space

envelopeAddress1=envelopeAddress1.trim().replaceAll("\\s{2,}", " ");
envelopeAddress2=envelopeAddress2.trim().replaceAll("\\s{2,}", " ");
envelopeAddress3=envelopeAddress3.trim().replaceAll("\\s{2,}", " ");
envelopeAddress4=envelopeAddress4.trim().replaceAll("\\s{2,}", " ");