Regular Expressions 101

1st Alternative^[ \t]*\/\/.*\r?\n

^start of line

Character Class[ \t]*

*matches any number of characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

\r?optionally matches a carriage return (ASCII 13)

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

2nd Alternative[ \t]*\/\/.*

Character Class[ \t]*

*matches any number of characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

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

^[ \t]*\/\/.*\r?\n|[ \t]*\/\/.*

// this is awesome code
const a =1

// this is nice
const b = 2 // oh great


  // with some indentation
const x = 99