Regular Expressions 101

Explanation
Pro

^start of string

Group uri(?P<uri>file://)?

?repeats the group contents below at most once:

file://the literal text file:// (case sensitive)

Group path(?P<path>(?:/?[A-Z]{1}:)?[\\/]?(?:[\w \-\.]+[\\/])+)

Non-Capturing Group(?:/?[A-Z]{1}:)?

?repeats the group contents below at most once:

/?optionally matches the literal / (47₁₀ / 57₈ / 2F₁₆)

Character Class[A-Z]{1}

{1}matches one character from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[\\/]?

?matches at most one character from the set below:

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:[\w \-\.]+[\\/])+

+repeats the group contents below at least once:

Character Class[\w \-\.]+

+matches at least one character from the set below:

\wa Unicode word character

the literal (32₁₀ / 40₈ / 20₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[\\/]

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group filename(?P<filename>[\w \-\.]+)?

?repeats the group contents below at most once:

Character Class[\w \-\.]+

+matches at least one character from the set below:

\wa Unicode word character

the literal (32₁₀ / 40₈ / 20₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:\.(?P<extension>[a-zA-Z0-9]+))?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group extension(?P<extension>[a-zA-Z0-9]+)

Character Class[a-zA-Z0-9]+

+matches at least one character from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

$end of string, or before its final line terminator

Global pattern flags

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

^(?P<uri>file://)?(?P<path>(?:/?[A-Z]{1}:)?[\\/]?(?:[\w \-\.]+[\\/])+)(?P<filename>[\w \-\.]+)?(?:\.(?P<extension>[a-zA-Z0-9]+))?$

New

/foo/bar/._baz.txt

Extraction

/foo/bar/._baz.txt