Regular Expressions 101

Pro

Group 1({\/\* )?

?repeats the group contents below at most once:

{the literal { (123₁₀ / 173₈ / 7B₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

#if the literal text #if (case sensitive)

Group 2((?:(?! \*\/}).)*)

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

*repeats the group contents below any number of times:

Negative Lookahead(?! \*\/})

the literal (32₁₀ / 40₈ / 20₁₆)

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

.any character (except for line terminators)

Group 3( \*\/})?

?repeats the group contents below at most once:

the literal (32₁₀ / 40₈ / 20₁₆)

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

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.

26 tokens

({\/\* )?#if ((?:(?! \*\/}).)*)( \*\/})?

New

{/* #if process.env.MODE === "std" */}
{/* #if process.env.MODE === "std"

{/* #if process.env.MODE === "std" */}
{/* #if process.env.MODE === "std"