Regular Expressions 101

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

Group 1((?:(?!\$\$).)*)

Non-Capturing Group(?:(?!\$\$).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!\$\$)

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

.any character (except for line terminators)

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

\$\$((?:(?!\$\$).)*)\$\$

New

$$ f'(x) = 12x^2 + 4x $$  $$ f'(x) = 12x+2x-12 $$  $$ f'(x) = 12x^3 +4x^2 $$