regex101: Python Match Workspace

Explanation

Pro

^start of line

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}:)? # start of path capture, optional windows top-level directory [\\/]? # optional start separator (?:[-. \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)

Comment: start of path capture, optional windows top-level directory

Character Class[\\/]?

?matches at most one character from the set below:

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Comment: optional start separator

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

+repeats the group contents below at least once:

Character Class[-. \w]+

+matches at least one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

\wa Unicode word character

Character Class[\\/]

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Comment: path

Group filename(?P<filename>\.?[^.\n]+?(?=\.(?P<extension>.+$)|$))?

?repeats the group contents below at most once:

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

Negated Character Class[^.\n]+?

+?matches at least one character outside the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

Positive Lookahead(?=\.(?P<extension>.+$)|$)

1st Alternative\.(?P<extension>.+$)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group extension(?P<extension>.+$)

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

$end of line

2nd Alternative$

$end of line

Global pattern flags

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

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Quick Reference

25 tokens

Regular Expression

^
(?P<uri>file://)?
(?P<path>(?:/?[A-Z]{1}:)?			# start of path capture, optional windows top-level directory
[\\/]?								# optional start separator
(?:[-. \w]+[\\/])+)				    # path
(?P<filename>\.?[^.\n]+?(?=\.(?P<extension>.+$)|$))?

New

/foo/bar.txt
/foo/bar/
/foo/makefile
./foo.txt
/foo/._bar.txt
/foo/_bar.bar.txt
foo/bar.txt
D:\foo\bar.m3u
file:///var/www/html/index.html
file:///C:/users/me/My Documents/index.html
/var/foo/bar.tar.gz

Substitution

/foo/bar.txt
/foo/bar/
/foo/makefile
./foo.txt
/foo/._bar.txt
/foo/_bar.bar.txt
foo/bar.txt
D:\foo\bar.m3u
file:///var/www/html/index.html
file:///C:/users/me/My Documents/index.html
/var/foo/bar.tar.gz