Regular Expressions 101

Explanation

Pro

^start of line

Group 1(.+?)

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

Character Class[\.\s]

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\sany whitespace character

Character Class[Ss]?

?matches at most one character from the set below:

Sthe literal S (83₁₀ / 123₈ / 53₁₆) (case sensitive)

sthe literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

Group 2((?:(?<=[Ss])\d)?\d)

Non-Capturing Group(?:(?<=[Ss])\d)?

?repeats the group contents below at most once:

Positive Lookbehind(?<=[Ss])

Character Class[Ss]

Sthe literal S (83₁₀ / 123₈ / 53₁₆) (case sensitive)

sthe literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

\da digit

\da digit

Character Class[\.\s]?

?matches at most one character from the set below:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\sany whitespace character

Character Class[EeXx]?

?matches at most one character from the set below:

Ethe literal E (69₁₀ / 105₈ / 45₁₆) (case sensitive)

ethe literal e (101₁₀ / 145₈ / 65₁₆) (case sensitive)

Xthe literal X (88₁₀ / 130₈ / 58₁₆) (case sensitive)

xthe literal x (120₁₀ / 170₈ / 78₁₆) (case sensitive)

Group 3(\d{2})

\d{2}a digit, repeated exactly 2 times

Non-Capturing Group(?:[\s\.](REPACK))?

?repeats the group contents below at most once:

Character Class[\s\.]

\sany whitespace character

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 4(REPACK)

REPACKthe literal text REPACK (case sensitive)

Group 5([\s\.].*)?

?repeats the group contents below at most once:

Character Class[\s\.]

\sany whitespace character

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 6(avi|mp4|mkv|wmv|mpg)

1st Alternativeavi

avithe literal text avi (case sensitive)

2nd Alternativemp4

mp4the literal text mp4 (case sensitive)

3rd Alternativemkv

mkvthe literal text mkv (case sensitive)

4th Alternativewmv

wmvthe literal text wmv (case sensitive)

5th Alternativempg

mpgthe literal text mpg (case sensitive)

$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

Unit Test Summary

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Quick Reference

25 tokens

Regular Expression

^(.+?)[\.\s][Ss]?((?:(?<=[Ss])\d)?\d)[\.\s]?[EeXx]?(\d{2})(?:[\s\.](REPACK))?([\s\.].*)?\.(avi|mp4|mkv|wmv|mpg)$

Unit Tests

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