lib: allow trailing whitespace in regex account aliases

Trailing whitespace in the replacement part of a regular expression
account alias is now significant. Eg, slightly flattening some bank
accounts: --alias '/:somebank:/=somebank '

hledger-lib/Hledger/Read/JournalReader.hs

@@ -321,7 +321,7 @@ basicaliasp = do
   old <- rstrip <$> (some $ noneOf ("=" :: [Char]))
   char '='
   many spacenonewline
-  new <- rstrip <$> anyChar `manyTill` eolof  -- don't require a final newline, good for cli options
+  new <- rstrip <$> anyChar `manyTill` eolof  -- eol in journal, eof in command lines, normally
   return $ BasicAlias (T.pack old) (T.pack new)
 
 regexaliasp :: TextParser m AccountAlias
@@ -333,7 +333,7 @@ regexaliasp = do
   many spacenonewline
   char '='
   many spacenonewline
-  repl <- rstrip <$> anyChar `manyTill` eolof
+  repl <- anyChar `manyTill` eolof
   return $ RegexAlias re repl
 
 endaliasesdirectivep :: JournalParser m ()

hledger-lib/doc/hledger_journal.5.m4.md

@@ -672,8 +672,6 @@ inside an account name, the matched part will be replaced by
 REPLACEMENT.
 If REGEX contains parenthesised match groups, these can be referenced
 by the usual numeric backreferences in REPLACEMENT.
-Note, currently regular expression aliases may cause noticeable slow-downs.
-(And if you use Ledger on your hledger file, they will be ignored.)
 Eg:
 
 ```journal
@@ -681,6 +679,9 @@ alias /^(.+):bank:([^:]+)(.*)/ = \1:\2 \3
 # rewrites "assets:bank:wells fargo:checking" to  "assets:wells fargo checking"
 ```
 
+Also note that REPLACEMENT continues to the end of line (or on command line,
+to end of option argument), so it can contain trailing whitespace. 
+
 #### Multiple aliases
 
 You can define as many aliases as you like using directives or command-line options.