Regular Expressions 101

Pro

Non-Capturing Group(?:^#\|\h+label:\h+|\G(?!^))

1st Alternative^#\|\h+label:\h+

^start of line

#the literal # (35₁₀ / 43₈ / 23₁₆)

\|the literal | (124₁₀ / 174₈ / 7C₁₆)

\h+any horizontal whitespace character, repeated at least once

label:the literal text label: (case sensitive)

\h+any horizontal whitespace character, repeated at least once

2nd Alternative\G(?!^)

\Gstart of current search

Negative Lookahead(?!^)

^start of line

Negated Character Class[^\r\n_]*

*matches any number of characters outside the set below:

\ra carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

25 tokens

(?:^#\|\h+label:\h+|\G(?!^))[^\r\n_]*\K_

New

#| label: my_chunk_label
my_function_name <- function(x)

#| label: my_chunk_label
my_function_name <- function(x)