Regular Expressions 101

Branch Reset Group(?|(e)(pisodes?)|(c)(hapters?)|(c)(hs?)|(e)(ps?)|(c)(s?)|(e)(s?)|()())

1st Alternative(e)(pisodes?)

Group 1(e)

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

Group 2(pisodes?)

pisodethe literal text pisode (case insensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case insensitive)

2nd Alternative(c)(hapters?)

Group 1(c)

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case insensitive)

Group 2(hapters?)

hapterthe literal text hapter (case insensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case insensitive)

3rd Alternative(c)(hs?)

Group 1(c)

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case insensitive)

Group 2(hs?)

hthe literal h (104₁₀ / 150₈ / 68₁₆) (case insensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case insensitive)

4th Alternative(e)(ps?)

Group 1(e)

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

Group 2(ps?)

pthe literal p (112₁₀ / 160₈ / 70₁₆) (case insensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case insensitive)

5th Alternative(c)(s?)

Group 1(c)

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case insensitive)

Group 2(s?)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case insensitive)

6th Alternative(e)(s?)

Group 1(e)

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

Group 2(s?)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case insensitive)

7th Alternative()()

Group 1() — does not consume characters

Group 2() — does not consume characters

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

Group 3((\d+(?:\.\d+)?(?:[A-Z]\b)?)(?:\s*(?:[,&+-]|and)\s*(?:(?:e(?:pisodes?)|c(?:hapters?)|c(?:hs?)|e(?:ps?)|c(?:s?)|e(?:s?)|)\s*)?(?4))*)

Group 4(\d+(?:\.\d+)?(?:[A-Z]\b)?)

\d+a Unicode decimal digit, repeated at least once

Non-Capturing Group(?:\.\d+)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a Unicode decimal digit, repeated at least once

Non-Capturing Group(?:[A-Z]\b)?

?repeats the group contents below at most once:

Character Class[A-Z]

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

\ba Unicode word boundary

Non-Capturing Group(?:\s*(?:[,&+-]|and)\s*(?:(?:e(?:pisodes?)|c(?:hapters?)|c(?:hs?)|e(?:ps?)|c(?:s?)|e(?:s?)|)\s*)?(?4))*

Global pattern flags

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

u modifier: unicode. Treats the pattern and subject as UTF-16

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?|(e)(pisodes?)|(c)(hapters?)|(c)(hs?)|(e)(ps?)|(c)(s?)|(e)(s?)|()())\s*((\d+(?:\.\d+)?(?:[A-Z]\b)?)(?:\s*(?:[,&+-]|and)\s*(?:(?:e(?:pisodes?)|c(?:hapters?)|c(?:hs?)|e(?:ps?)|c(?:s?)|e(?:s?)|)\s*)?(?4))*)

New

chapter 2A Hello 
chapter 2AHello
text chapter 25.6 text
 // c~25.6
text chapters 23, 24, 25 text
 // c~23-25
text chapter 23, 25 text
 // c~23 & 25
text chapter 23 & 24 & 25 text
 // c~23-25
text c25.5-30 text
 // c~25.5-30
text c99-c102 text
 // c~99-102
text chapter 1 - 3 text
 // c~1-3
33 text chapter 1, 2 text 3
 // c~1-2
chapter 25.6 & chapter 29
 // c~25.6 & 29
chapter 25+c26
 // c~25-26
chapter 25 + 26 + 27
 // c~25-27
chapter 10.4C
 = c~10.4 part 3
chapter 2B
 = c~2 part 2

Substitution