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doc: regex aliases update (#1832)

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Simon Michael 2022-03-10 17:13:34 -10:00
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hledger/hledger.m4.md
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@ -3216,29 +3216,33 @@ alias checking = assets:bank:wells fargo:checking
### Regex aliases
There is also a more powerful variant that uses a [regular expression],
indicated by the forward slashes:
indicated by wrapping the pattern in forward slashes.
(This is the only place where hledger requires forward slashes around a regular expression.)
Eg:
```journal
alias /REGEX/ = REPLACEMENT
```
or:
```cli
$ hledger --alias '/REGEX/=REPLACEMENT' ...
```
or `--alias '/REGEX/=REPLACEMENT'`.
Any part of an account name matched by REGEX will be replaced by REPLACEMENT.
REGEX is case-insensitive as usual.
If you need to match a forward slash, escape it with a backslash, eg `/\/=:`.
<!-- (Can also be written `'/REGEX/REPLACEMENT/'`). -->
REGEX is a case-insensitive regular expression. Anywhere it matches
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.
Eg:
by the usual backslash and number in REPLACEMENT:
```journal
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.
REPLACEMENT continues to the end of line (or on command line, to end of option argument),
so it can contain trailing whitespace.
### Combining aliases