regex101: Compare two comma separated 4-digit years (first must be greater)

Pro

^start of line

Group born(?<born> # BORN part start (?:(?<o>1)|(?<t>2)|(?<h>3)|(?<f>4)|(?<v>5)|(?<s>6)|(?<n>7)|(?<e>8)|(?<i>9)|(?<z>0)) # Thousands (?:(?<o2>1)|(?<t2>2)|(?<h2>3)|(?<f2>4)|(?<v2>5)|(?<s2>6)|(?<n2>7)|(?<e2>8)|(?<i2>9)|(?<z2>0)) # Centuries (?:(?<o3>1)|(?<t3>2)|(?<h3>3)|(?<f3>4)|(?<v3>5)|(?<s3>6)|(?<n3>7)|(?<e3>8)|(?<i3>9)|(?<z3>0)) # Decades (?:(?<o4>1)|(?<t4>2)|(?<h4>3)|(?<f4>4)|(?<v4>5)|(?<s4>6)|(?<n4>7)|(?<e4>8)|(?<i4>9)|(?<z4>0)) # Last digit )

Comment: BORN part start

Non-Capturing Group(?:(?<o>1)|(?<t>2)|(?<h>3)|(?<f>4)|(?<v>5)|(?<s>6)|(?<n>7)|(?<e>8)|(?<i>9)|(?<z>0))

1st Alternative(?<o>1)

Group o(?<o>1)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2nd Alternative(?<t>2)

Group t(?<t>2)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

3rd Alternative(?<h>3)

Group h(?<h>3)

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

4th Alternative(?<f>4)

Group f(?<f>4)

4the literal 4 (52₁₀ / 64₈ / 34₁₆)

5th Alternative(?<v>5)

Group v(?<v>5)

5the literal 5 (53₁₀ / 65₈ / 35₁₆)

6th Alternative(?<s>6)

Group s(?<s>6)

6the literal 6 (54₁₀ / 66₈ / 36₁₆)

7th Alternative(?<n>7)

Group n(?<n>7)

7the literal 7 (55₁₀ / 67₈ / 37₁₆)

8th Alternative(?<e>8)

Group e(?<e>8)

8the literal 8 (56₁₀ / 70₈ / 38₁₆)

9th Alternative(?<i>9)

Group i(?<i>9)

9the literal 9 (57₁₀ / 71₈ / 39₁₆)

10th Alternative(?<z>0)

Group z(?<z>0)

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Comment: Thousands

Non-Capturing Group(?:(?<o2>1)|(?<t2>2)|(?<h2>3)|(?<f2>4)|(?<v2>5)|(?<s2>6)|(?<n2>7)|(?<e2>8)|(?<i2>9)|(?<z2>0))

1st Alternative(?<o2>1)

Group o2(?<o2>1)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2nd Alternative(?<t2>2)

3rd Alternative(?<h2>3)

4th Alternative(?<f2>4)

5th Alternative(?<v2>5)

6th Alternative(?<s2>6)

7th Alternative(?<n2>7)

8th Alternative(?<e2>8)

9th Alternative(?<i2>9)

10th Alternative(?<z2>0)

Comment: Centuries

Non-Capturing Group(?:(?<o3>1)|(?<t3>2)|(?<h3>3)|(?<f3>4)|(?<v3>5)|(?<s3>6)|(?<n3>7)|(?<e3>8)|(?<i3>9)|(?<z3>0))

Comment: Decades

Non-Capturing Group(?:(?<o4>1)|(?<t4>2)|(?<h4>3)|(?<f4>4)|(?<v4>5)|(?<s4>6)|(?<n4>7)|(?<e4>8)|(?<i4>9)|(?<z4>0))

Comment: Last digit

, the literal text ,

Negative Lookahead(?!\k<born>)

Comment: Fail if years are identical

Non-Capturing Group(?: #1st digit is lower (?:(?(o)0|(?(t)[01]|(?(h)[0-2]|(?(f)[0-3]|(?(v)[0-4]|(?(s)[0-5]|(?(n)[0-6]|(?(e)[0-7]|(?(i)[0-8]|-1)))))))))) \d{3} | #1st digit is lower or identical (?:(?(o)[01]|(?(t)[0-2]|(?(h)[0-3]|(?(f)[0-4]|(?(v)[0-5]|(?(s)[0-6]|(?(n)[0-7]|(?(e)[0-8]|(?(i)[0-9]|-1)))))))))) #and 2nd is lower (?:(?(o2)0|(?(t2)[01]|(?(h2)[0-2]|(?(f2)[0-3]|(?(v2)[0-4]|(?(s2)[0-5]|(?(n2)[0-6]|(?(e2)[0-7]|(?(i2)[0-8]|-1)))))))))) \d{2} | #1st digit is lower or identical (?:(?(o)[01]|(?(t)[0-2]|(?(h)[0-3]|(?(f)[0-4]|(?(v)[0-5]|(?(s)[0-6]|(?(n)[0-7]|(?(e)[0-8]|(?(i)[0-9]|-1)))))))))) #and 2nd is lower or identical (?:(?(o2)[01]|(?(t2)[0-2]|(?(h2)[0-3]|(?(f2)[0-4]|(?(v2)[0-5]|(?(s2)[0-6]|(?(n2)[0-7]|(?(e2)[0-8]|(?(i2)[0-9]|-1)))))))))) #and 3rd is lower (?:(?(o3)0|(?(t3)[01]|(?(h3)[0-2]|(?(f3)[0-3]|(?(v3)[0-4]|(?(s3)[0-5]|(?(n3)[0-6]|(?(e3)[0-7]|(?(i3)[0-8]|-1)))))))))) \d | #1st digit is lower or identical (?:(?(o)[01]|(?(t)[0-2]|(?(h)[0-3]|(?(f)[0-4]|(?(v)[0-5]|(?(s)[0-6]|(?(n)[0-7]|(?(e)[0-8]|(?(i)[0-9]|-1)))))))))) #and 2nd is lower or identical (?:(?(o2)[01]|(?(t2)[0-2]|(?(h2)[0-3]|(?(f2)[0-4]|(?(v2)[0-5]|(?(s2)[0-6]|(?(n2)[0-7]|(?(e2)[0-8]|(?(i2)[0-9]|-1)))))))))) #and 3rd is lower or identical (?:(?(o3)[01]|(?(t3)[0-2]|(?(h3)[0-3]|(?(f3)[0-4]|(?(v3)[0-5]|(?(s3)[0-6]|(?(n3)[0-7]|(?(e3)[0-8]|(?(i3)[0-9]|-1)))))))))) #and 4th is lower (?:(?(o4)0|(?(t4)[01]|(?(h4)[0-2]|(?(f4)[0-3]|(?(v4)[0-4]|(?(s4)[0-5]|(?(n4)[0-6]|(?(e4)[0-7]|(?(i4)[0-8]|-1)))))))))) )

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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

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

25 tokens

Regular Expression

^ 
 (?<born>                      # BORN part start
  (?:(?<o>1)|(?<t>2)|(?<h>3)|(?<f>4)|(?<v>5)|(?<s>6)|(?<n>7)|(?<e>8)|(?<i>9)|(?<z>0))            # Thousands
  (?:(?<o2>1)|(?<t2>2)|(?<h2>3)|(?<f2>4)|(?<v2>5)|(?<s2>6)|(?<n2>7)|(?<e2>8)|(?<i2>9)|(?<z2>0))  # Centuries
  (?:(?<o3>1)|(?<t3>2)|(?<h3>3)|(?<f3>4)|(?<v3>5)|(?<s3>6)|(?<n3>7)|(?<e3>8)|(?<i3>9)|(?<z3>0))  # Decades
  (?:(?<o4>1)|(?<t4>2)|(?<h4>3)|(?<f4>4)|(?<v4>5)|(?<s4>6)|(?<n4>7)|(?<e4>8)|(?<i4>9)|(?<z4>0))  # Last digit
 )  
 ,  
 (?!\k<born>) #Fail if years are identical
 (?:
  #1st digit is lower
  (?:(?(o)0|(?(t)[01]|(?(h)[0-2]|(?(f)[0-3]|(?(v)[0-4]|(?(s)[0-5]|(?(n)[0-6]|(?(e)[0-7]|(?(i)[0-8]|-1)))))))))) \d{3}  |
  #1st digit is lower or identical
  (?:(?(o)[01]|(?(t)[0-2]|(?(h)[0-3]|(?(f)[0-4]|(?(v)[0-5]|(?(s)[0-6]|(?(n)[0-7]|(?(e)[0-8]|(?(i)[0-9]|-1))))))))))
    #and 2nd is lower 
    (?:(?(o2)0|(?(t2)[01]|(?(h2)[0-2]|(?(f2)[0-3]|(?(v2)[0-4]|(?(s2)[0-5]|(?(n2)[0-6]|(?(e2)[0-7]|(?(i2)[0-8]|-1)))))))))) \d{2} |
  #1st digit is lower or identical
  (?:(?(o)[01]|(?(t)[0-2]|(?(h)[0-3]|(?(f)[0-4]|(?(v)[0-5]|(?(s)[0-6]|(?(n)[0-7]|(?(e)[0-8]|(?(i)[0-9]|-1))))))))))
    #and 2nd is lower or identical
    (?:(?(o2)[01]|(?(t2)[0-2]|(?(h2)[0-3]|(?(f2)[0-4]|(?(v2)[0-5]|(?(s2)[0-6]|(?(n2)[0-7]|(?(e2)[0-8]|(?(i2)[0-9]|-1))))))))))
      #and 3rd is lower
      (?:(?(o3)0|(?(t3)[01]|(?(h3)[0-2]|(?(f3)[0-3]|(?(v3)[0-4]|(?(s3)[0-5]|(?(n3)[0-6]|(?(e3)[0-7]|(?(i3)[0-8]|-1)))))))))) \d |
  #1st digit is lower or identical
  (?:(?(o)[01]|(?(t)[0-2]|(?(h)[0-3]|(?(f)[0-4]|(?(v)[0-5]|(?(s)[0-6]|(?(n)[0-7]|(?(e)[0-8]|(?(i)[0-9]|-1))))))))))
    #and 2nd is lower or identical
    (?:(?(o2)[01]|(?(t2)[0-2]|(?(h2)[0-3]|(?(f2)[0-4]|(?(v2)[0-5]|(?(s2)[0-6]|(?(n2)[0-7]|(?(e2)[0-8]|(?(i2)[0-9]|-1))))))))))
      #and 3rd is lower or identical
      (?:(?(o3)[01]|(?(t3)[0-2]|(?(h3)[0-3]|(?(f3)[0-4]|(?(v3)[0-5]|(?(s3)[0-6]|(?(n3)[0-7]|(?(e3)[0-8]|(?(i3)[0-9]|-1))))))))))
        #and 4th is lower
        (?:(?(o4)0|(?(t4)[01]|(?(h4)[0-2]|(?(f4)[0-3]|(?(v4)[0-4]|(?(s4)[0-5]|(?(n4)[0-6]|(?(e4)[0-7]|(?(i4)[0-8]|-1))))))))))
)
$