Regular Expressions 101

^start of line

Non-Capturing Group(?:\d*?(9)|\d*?(8)|\d*?(7)|\d*?(6)|\d*?(5)|\d*?(4)|\d*?(3)|\d*(2)|\d*(1))

1st Alternative\d*?(9)

\d*?a digit, repeated any number of times

Group 1(9)

9the literal 9 (57₁₀ / 71₈ / 39₁₆)

2nd Alternative\d*?(8)

\d*?a digit, repeated any number of times

Group 2(8)

8the literal 8 (56₁₀ / 70₈ / 38₁₆)

3rd Alternative\d*?(7)

\d*?a digit, repeated any number of times

Group 3(7)

7the literal 7 (55₁₀ / 67₈ / 37₁₆)

4th Alternative\d*?(6)

\d*?a digit, repeated any number of times

Group 4(6)

6the literal 6 (54₁₀ / 66₈ / 36₁₆)

5th Alternative\d*?(5)

\d*?a digit, repeated any number of times

Group 5(5)

5the literal 5 (53₁₀ / 65₈ / 35₁₆)

6th Alternative\d*?(4)

\d*?a digit, repeated any number of times

Group 6(4)

4the literal 4 (52₁₀ / 64₈ / 34₁₆)

7th Alternative\d*?(3)

\d*?a digit, repeated any number of times

Group 7(3)

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

8th Alternative\d*(2)

\d*a digit, repeated any number of times

Group 8(2)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

9th Alternative\d*(1)

\d*a digit, repeated any number of times

Group 9(1)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Non-Capturing Group(?:\d*(9)|\d*(8)|\d*(7)|\d*(6)|\d*(5)|\d*(4)|\d*(3)|\d*(2)|\d*(1))

1st Alternative\d*(9)

\d*a digit, repeated any number of times

Group 10(9)

9the literal 9 (57₁₀ / 71₈ / 39₁₆)

2nd Alternative\d*(8)

\d*a digit, repeated any number of times

Group 11(8)

8the literal 8 (56₁₀ / 70₈ / 38₁₆)

3rd Alternative\d*(7)

\d*a digit, repeated any number of times

Group 12(7)

4th Alternative\d*(6)

5th Alternative\d*(5)

6th Alternative\d*(4)

7th Alternative\d*(3)

8th Alternative\d*(2)

9th Alternative\d*(1)

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

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26 tokens

Regular Expression

^(?:\d*?(9)|\d*?(8)|\d*?(7)|\d*?(6)|\d*?(5)|\d*?(4)|\d*?(3)|\d*(2)|\d*(1))(?:\d*(9)|\d*(8)|\d*(7)|\d*(6)|\d*(5)|\d*(4)|\d*(3)|\d*(2)|\d*(1))

Unit Tests

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