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;regex doc tweaks

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Simon Michael 2020-05-10 13:11:53 -07:00
parent f167c223a2
commit 71111148ed
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hledger/hledger.m4.md
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@ -834,10 +834,10 @@ If they're not doing what you expect, it's important to know exactly what they s
#. they are infix matching (they do not need to match the entire thing being matched) #. they are infix matching (they do not need to match the entire thing being matched)
#. they are [POSIX ERE][] (extended regular expressions) #. they are [POSIX ERE][] (extended regular expressions)
#. they also support [GNU word boundaries][] (`\b`, `\B`, `\<`, `\>`) #. they also support [GNU word boundaries][] (`\b`, `\B`, `\<`, `\>`)
#. they do not support [mode modifiers][] (like `(?s)`) #. they do not support [backreferences][] - if you write `\1`, it will match the digit `1`.
#. when searching, they do not support [capturing groups][] and [backreferences][] (`\1`). Except when doing text replacement, eg in [account aliases](journal.html#regex-aliases),
But when used for text replacement (eg in [account aliases](journal.html#regex-aliases)), where [backreferences][] can be used the replacement string to reference [capturing groups][] in the search string.
they do support [capturing groups][] in the search string and [backreferences][] in the replacement string. #. they do not support [mode modifiers][] (`(?s)`), character classes (`\w`, `\d`), or anything else.
[POSIX ERE]: http://www.regular-expressions.info/posix.html#ere [POSIX ERE]: http://www.regular-expressions.info/posix.html#ere
[backreferences]: https://www.regular-expressions.info/backref.html [backreferences]: https://www.regular-expressions.info/backref.html