regex101: Replace variable value with variable

Group 1(--([A-z\-]*?):(?<!--rgb:))

--the literal text --

Group 2([A-z\-]*?)

Character Class[A-z\-]*?

*?matches any number of characters from the set below:

A-zone character from A (65₁₀) to z (122₁₀) (case sensitive)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Negative Lookbehind(?<!--rgb:)

--rgb:the literal text --rgb: (case sensitive)

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

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

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

Search reference

Regular Expression

(--([A-z\-]*?):(?<!--rgb:)).*?;

New

  --color-primary: #0017a8;
  --color-primary--rgb: #{hexToRGB(color-primary)};
  --variablename: blabla blablabla;
  --color-secondary: #0631ff;
  --color-secondary--rgb: #{hexToRGB(color-secondary)};
  --color-tertiary: #00ffe0;
  --color-tertiary--rgb: #{hexToRGB(color-tertiary)};
  --color-green-dark: #257426;
  --color-green-dark--rgb: #{hexToRGB(color-green-dark)};

  --font-family: TTCommons, Helvetica, Arial, sans-serif;
  --transition: 0.3s ease;
  --box-shadow: 0 0 12px 0 rgba(0, 0, 0, 0.3);

Regular Expressions 101

Regular Expression

Extraction