replace string literal cannot escape $ next to a capture group
#21462
Comments
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@darinspivey it should be: Had you already tried that? The |
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This is mentioned here: https://vector.dev/docs/reference/configuration/#escaping. Admittedly it is one of the trickier foot guns to be aware of when using capture groups. |
Yes, I tried that, but it's not the desired outcome. The docs say to escape it with The intention is to grab the numeric price, and add a static |
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Oh I see. You want a leading The reason you need so many The regex crate also uses Does that make sense? |
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My goodness! I stopped trying after 4 dollars wouldn't work thinking that it would just rinse/repeat the behavior with 4. This indeed does work, although I would suggest adding some examples such as this to the docs. It's not quite enough to read that As an aside, do you have a similar fix for the single backslash problem mentioned above? Seems very similar, although it could be a separate string literal issue. Thanks, @jszwedko ! |
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No worries! It is definitely confusing. I opened #21467 to try to better document it. For getting a single backslash character in string literals |
Absolutely. Thank you for the docs update on this issue--that's much clearer. |
A note for the community
Problem
There seems to be some issues with escaping certain things within string literals, as dollar sign
$has multiple uses${VAR}replacecommand (which must be escaped with$$in conf files)$With the
replacecommand, it is not possible to escape a$immediately preceding a capture group, which is useful when dealing with price data. Consider the followingreplace_withstring literals, assuming the price has been placed in apricecapture group:As an aside, a similar issue happens when trying to escape a single backslash within a string literal.
This condition may be a separate issue, but it also has a workaround. You can split the string literal into parts and use concatenation with the string type. but it's messy. For example,
s'endinbackslash' + "\\". However, this workaround does not work withreplace_withbecause the concatenated string portion does not honor capture group names.Configuration
Version
vector 0.42.0 (aarch64-apple-darwin)
Debug Output
Example Data
The configuration provided will re-produce the problem with example data inline.
Additional Context
No response
References
There have been other issues regarding escaping
$, but not this specifically. I did not look into the backslash condition since I found a workaround, although not ideal.${FOO}but not$FOO#8136The text was updated successfully, but these errors were encountered: