Regular Expressions 101

Negative Lookbehind(?<![^/])

Negated Character Class[^/]

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Negative Lookahead(?!\.\.(?![^/]))

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negative Lookahead(?![^/])

Negated Character Class[^/]

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Negated Character Class[^/]+

+matches at least one character outside the set below:

/the literal / (47₁₀ / 57₈ / 2F₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:/|$)

1st Alternative/

/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternative$

$end of line

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

Regular Expression

(?<![^/])(?!\.\.(?![^/]))[^/]+/\.\.(?:/|$)

New

"folders/folder1/folder5/../../folder2" -> "folders/folder2"

"folders/folder1/../../../folder2" -> "../folder2"

"folders/folder1/folder5/../folder2" -> "folders/folder1/folder2"

Extraction

"folders/folder1/folder5/../../folder2" -> "folders/folder2"

"folders/folder1/../../../folder2" -> "../folder2"

"folders/folder1/folder5/../folder2" -> "folders/folder1/folder2"