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;doc: regular expressions: note possible RTL/bidi limitation

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Simon Michael 2024-10-21 12:42:39 -10:00
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hledger/hledger.m4.md
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@ -534,6 +534,7 @@ If they're not doing what you expect, it's important to know exactly what they s
can be used in the replacement string to reference [capturing groups] in the can be used in the replacement string to reference [capturing groups] in the
search regexp. Otherwise, if you write `\1`, it will match the digit `1`. search regexp. Otherwise, if you write `\1`, it will match the digit `1`.
6. they do not support [mode modifiers] (`(?s)`), character classes (`\w`, `\d`), or anything else not mentioned above. 6. they do not support [mode modifiers] (`(?s)`), character classes (`\w`, `\d`), or anything else not mentioned above.
7. they may not (I'm guessing not) properly support right-to-left or bidirectional text.
[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