regex - java replaceAll and '+' match -
regex - java replaceAll and '+' match - i have code setup remove spaces in between words of title string formattedstring = unformattedstring.replaceall(" +"," "); my understanding of type of regex match many spaces possible before stopping. however, strings coming out not changing in way. possible it's matching 1 space @ time, , replacing space? there replaceall method, since it's doing multiple matches, alter way type of match work here? a improve approach might utilize "\\s+" match runs of possible whitespace characters. edit another approach might extract matches "\\b([a-za-z0-9]+)\\b" , bring together them using space allow remove except valid words , numbers. if need preserve punctuation, utilize "(\\s+)" capture runs of non-whitespace characters. java regex