Question

Does anyone out there know of a regex command that will take the following string

 url = http://184.154.145.114:8013/wlraac name = wlr  samplerate = 44100 channels = 2       format = S16le

and remove everything but the following

 wlr

This line will come up multiple times, where everything changes after the = sign and each time all I want to keep is whats after name =

any help is appreciated

Answer 1

You could do something like

.*name =\s*(\w+).*

and replace with the content of group 1

See it here on Regexr

I search for “name =” and anything before. The \s* matches the following whitespace.

Then the \w+ inside brackets. \w will match any character and digit and underscore (if you use the option Pattern.UNICODE_CHARACTER_CLASS otherwise it sticks to ASCII only) . Because of the brackets it is stored in the first group.

String in = " url = http://184.154.145.114:8013/wlraac name = wlr  samplerate = 44100 channels = 2       format = S16le";

Pattern r = Pattern.compile(".*name =\\s*(\\w+).*");
Matcher m = r.matcher(in);

String result = m.replaceAll("$1");
System.out.println(result);

Or your code

String str = line2.replaceAll(".*name =\\S*(\\W).*", "$1");