Regular Expressions 101

Non-Capturing Group(?:(?:^label:|(?<!\A)\G)\R(\S+)|^\w+(?=:))

1st Alternative(?:^label:|(?<!\A)\G)\R(\S+)

Non-Capturing Group(?:^label:|(?<!\A)\G)

1st Alternative^label:

^start of line

label:the literal text label: (case sensitive)

2nd Alternative(?<!\A)\G

Negative Lookbehind(?<!\A)

\Astart of string

\Gstart of current search

\Ra newline sequence

Group 1(\S+)

\S+any non-whitespace character, repeated at least once

2nd Alternative^\w+(?=:)

^start of line

\w+any word character, repeated at least once

Positive Lookahead(?=:)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Positive Lookahead(?=(?:.*\R)+---)

Non-Capturing Group(?:.*\R)+

+repeats the group contents below at least once:

.*any character (except for line terminators), repeated any number of times

\Ra newline sequence

---the literal text ---

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.

Search reference

Regular Expression

(?:(?:^label:|(?<!\A)\G)\R(\S+)|^\w+(?=:))(?=(?:.*\R)+---)

New

---
title: This is a title
label:
one
two
three
ultra
description: "this is a description text"
other_key: value
---

note: this is a note outside the front matter
tip: this is a tip ...
one: this is a one

Regular Expression

Extraction