Regular Expressions 101

Pro

^start of line

Group 1(.*?)

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

\ban ASCII word boundary

Group 2(X{1,3}(?:I[XV]|V?I{0,3})|I[XV]|V?I{1,3}|V)

1st AlternativeX{1,3}(?:I[XV]|V?I{0,3})

X{1,3}the literal X (88₁₀ / 130₈ / 58₁₆) (case sensitive), repeated between 1 and 3 times

Non-Capturing Group(?:I[XV]|V?I{0,3})

1st AlternativeI[XV]

Ithe literal I (73₁₀ / 111₈ / 49₁₆) (case sensitive)

Character Class[XV]

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

Vthe literal V (86₁₀ / 126₈ / 56₁₆) (case sensitive)

2nd AlternativeV?I{0,3}

V?optionally matches the literal V (86₁₀ / 126₈ / 56₁₆) (case sensitive)

I{0,3}the literal I (73₁₀ / 111₈ / 49₁₆) (case sensitive), repeated between 0 and 3 times

2nd AlternativeI[XV]

Ithe literal I (73₁₀ / 111₈ / 49₁₆) (case sensitive)

Character Class[XV]

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

Vthe literal V (86₁₀ / 126₈ / 56₁₆) (case sensitive)

3rd AlternativeV?I{1,3}

V?optionally matches the literal V (86₁₀ / 126₈ / 56₁₆) (case sensitive)

I{1,3}the literal I (73₁₀ / 111₈ / 49₁₆) (case sensitive), repeated between 1 and 3 times

4th AlternativeV

Vthe literal V (86₁₀ / 126₈ / 56₁₆) (case sensitive)

\ban ASCII word boundary

Group 3(.)

.any character (except for line terminators)

\ban ASCII word boundary

Group 4(EP\.)

EPthe literal text EP (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\s*any whitespace character, repeated any number of times

Group 5(\d+)

\d+a digit, repeated at least once

Group 6(.*)

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

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

^(.*?)\b(X{1,3}(?:I[XV]|V?I{0,3})|I[XV]|V?I{1,3}|V)\b(.)\b(EP\.)\s*(\d+)(.*)

New

PEPA THE PIG XVI EP. 169 - BAD ENDING