java - Regex not working with Stream filter() -

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i trying text out line when using new stream in java 8.

this reading in:

46 [core1] 56 [core1] 45 [core1] 45 [core2] 67 [core2] 54 [core2]

and here code read currently:

path path = paths.get("./src/main/resources/", "data.txt");             try(stream<string> lines = files.lines(path)){                 list<integer> temps = new arraylist<>();                 lines                         .filter(line -> line.contains("[core1]"))                         .filter(line -> line.contains("(\\d+).*"))                         .flatmaptoint(temperature -> intstream.of(integer.parseint(temperature)))                         .foreach(system.out::println);                 system.out.print(temps.size());             }

i have checked regex expression in https://www.regex101.com/ , seems work fine. if search [core1] string, find it.

the problem when using of together, 0 matches. logic behind read line, see core is, , it's number before it. after want add list.

what doing wrong here?

contains works strings (regexes not supported)... can use line.matches("(\\d+).*") achieving same.


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