Regular Expressions 101

Pro

Definition Group(?(DEFINE)(?'a'(((eyr|hcl|ecl|hgt|iyr|byr|pid):[^\s]+)))(?'b'([ \n]|$)))

Group a(?'a'(((eyr|hcl|ecl|hgt|iyr|byr|pid):[^\s]+)))

Group 2(((eyr|hcl|ecl|hgt|iyr|byr|pid):[^\s]+))

Group 3((eyr|hcl|ecl|hgt|iyr|byr|pid):[^\s]+)

Group 4(eyr|hcl|ecl|hgt|iyr|byr|pid)

1st Alternativeeyr

eyrthe literal text eyr (case sensitive)

2nd Alternativehcl

hclthe literal text hcl (case sensitive)

3rd Alternativeecl

eclthe literal text ecl (case sensitive)

4th Alternativehgt

hgtthe literal text hgt (case sensitive)

5th Alternativeiyr

iyrthe literal text iyr (case sensitive)

6th Alternativebyr

byrthe literal text byr (case sensitive)

7th Alternativepid

pidthe literal text pid (case sensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Negated Character Class[^\s]+

+matches at least one character outside the set below:

\sany whitespace character

Group b(?'b'([ \n]|$))

Group 6([ \n]|$)

1st Alternative[ \n]

Character Class[ \n]

the literal (32₁₀ / 40₈ / 20₁₆)

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

2nd Alternative$

$end of line

Group 7((((?P>a)(?P>b)){7})|(((?P>a)|(cid:[^\s]+))(?P>b)){8})

1st Alternative(((?P>a)(?P>b)){7})

Group 8(((?P>a)(?P>b)){7})

Group 9((?P>a)(?P>b)){7}

{7}repeats the group contents below exactly 7 times:

(?P>a)calls group a as a subroutine

(?P>b)calls group b as a subroutine

2nd Alternative(((?P>a)|(cid:[^\s]+))(?P>b)){8}

Group 10(((?P>a)|(cid:[^\s]+))(?P>b)){8}

{8}repeats the group contents below exactly 8 times:

Group 11((?P>a)|(cid:[^\s]+))

1st Alternative(?P>a)

2nd Alternative(cid:[^\s]+)

(?P>b)calls group b as a subroutine

Group 13(\n\n|$)

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

No unit tests · Add a test to get started

25 tokens

Regular Expression

(?(DEFINE)(?'a'(((eyr|hcl|ecl|hgt|iyr|byr|pid):[^\s]+)))(?'b'([ \n]|$)))((((?P>a)(?P>b)){7})|(((?P>a)|(cid:[^\s]+))(?P>b)){8})(\n\n|$)

Unit Tests

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