I would like to replace every _ with a - on lines starting with #| label: using PCRE2 regex within my text editor.
Example:
#| label: my_chunk_label
my_function_name <- function(x)
Should become:
#| label: my-chunk-label
my_function_name <- function(x)
In contrast to .NET regex, where one could substitute (?<=^#\| label: .+)_ with - (regex101 example), PCRE2 does not support infinite lookbehind so the regex is invalid. So far, the only way I found was to repeatedly substitute ^#[^_]+\K_ with - (regex101 example) but I was curious if there is a single-pass solution.
If you are using pcre, you could make use of \G and \K
Then in the replacement use -
(?:^#\|\h+label:\h+|\G(?!^))[^\r\n_]*\K_
The pattern matches:
(?: Non capture group for the alternatives
^#\|\h+label:\h+ Match the pattern that should be at the start of the string, where \h matches a horizontal whitespace character| Or\G(?!^) Assert the current position at the end of the previous match, not at the start) Close the non capture group[^\r\n_]* Match optional characters except for newlines or _\K Forget what is matched so far_ Match the underscore