Regular Expressions 101

Pro

^start of line

Negative Lookahead(?!\/)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Negative Lookahead(?!.*(?:^|\/)\.\.\/)

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

Non-Capturing Group(?:^|\/)

1st Alternative^

^start of line

2nd Alternative\/

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.+any Unicode character (except for line terminators), repeated at least once

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.

25 tokens

^(?!\/)(?!.*(?:^|\/)\.\.\/).+

New

/my/path
../my/path
/my/../path
my/../path
my/../../path
my/../path/../is/bad

my/path
./my/path
my/./path