Scala multiline regex / regular expression (?m) not working -

Scala multiline regex / regular expression (?m) not working -

(all of illustration can run through scala repl or sbt console)

i have multiline string:

val a= "a0da000043\n"+ "a020000008933f57845f706921\n"+ "a0a0000000 (9000)\n"+ "a0a40000027fde (9fxx,9000) \n"+ "84e400000bd2012f261c86bc6c3c679f (6101,9000)\n"+ "00a4040008a000000151000000 (61xx,9000)"

then have regular expression:

(?m)^ *(?:[0-9a-f]{2})+(?: +\([0-9a-fx,]+\))? *$

i utilize this:

scala> """(?m)^ *(?:[0-9a-f]{2})+(?: +\([0-9a-fx,]+\))? *$""".r.pattern.matcher(a).matches() res10: boolean = false

but if this:

scala> ("""(?m)^ *(?:[0-9a-f]{2})+(?: +\([0-9a-fx,]+\))? *$""".r findallin a).tolist res8: list[string] = list(a0da000043, a020000008933f57845f706921, a0a0000000 (9000), "a0a40000027fde (9fxx,9000) ", 84e400000bd2012f261c86bc6c3c679f (6101,9000), 00a4040008a000000151000000 (61xx,9000))

it returns lines. wonder why .matches() not working.

if seek single line in .matches

scala> """(?m)^ *(?:[0-9a-f]{2})+(?: +\([0-9a-fx,]+\))? *$""".r.pattern.matcher("a0a40000027fde (9fxx,9000)").matches() res9: boolean = true

now simplest multi line regex not working

"(?m)^foo$".r.pattern.matcher("foo\nfoo").matches() res38: boolean = false

what wrong? can give illustration on how utilize (?m) or seek match val a.

i want know if val lines matches regex.

thanks in advance

edit: tried of reply below, utilize (?s) , .* newline. worked illustration 1 considering invalid info valid. ex:

scala> val c = "a0a0000000 (9000" c: string = a0a0000000 (9000 scala> """(?s)^ *(?:[0-9a-f]{2})+(?: +\([0-9a-fx,]+\))? *.*$""".r.pattern.matcher(c).matches() res45: boolean = true

because matches tries match whole string. "(?m)^foo$" regex won't match newline character , next foo string nowadays in input string foo\nfoo.

the below code homecoming true, because regex used, match whole string.

"(?s)^foo.*$".r.pattern.matcher("foo\nfoo").matches()

regex scala pattern-matching multiline