Regular Expressions 101

Pro

1st Alternative^5[1-5]\d{14}$

^start of line

5the literal 5 (53₁₀ / 65₈ / 35₁₆)

Character Class[1-5]

1-5one character from 1 (49₁₀) to 5 (53₁₀)

\d{14}a digit, repeated exactly 14 times

$end of line

2nd Alternative^2(?:2(?:2[1-9]|[3-9]\d)|[3-6]\d\d|7(?:[01]\d|20))\d{12}$

^start of line

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Non-Capturing Group(?:2(?:2[1-9]|[3-9]\d)|[3-6]\d\d|7(?:[01]\d|20))

1st Alternative2(?:2[1-9]|[3-9]\d)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Non-Capturing Group(?:2[1-9]|[3-9]\d)

1st Alternative2[1-9]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

2nd Alternative[3-9]\d

Character Class[3-9]

3-9one character from 3 (51₁₀) to 9 (57₁₀)

\da digit

2nd Alternative[3-6]\d\d

Character Class[3-6]

3-6one character from 3 (51₁₀) to 6 (54₁₀)

\da digit

3rd Alternative7(?:[01]\d|20)

7the literal 7 (55₁₀ / 67₈ / 37₁₆)

Non-Capturing Group(?:[01]\d|20)

1st Alternative[01]\d

Character Class[01]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

\da digit

2nd Alternative20

20the literal text 20

\d{12}a digit, repeated exactly 12 times

$end of line

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.

26 tokens

Regular Expression

^5[1-5]\d{14}$|^2(?:2(?:2[1-9]|[3-9]\d)|[3-6]\d\d|7(?:[01]\d|20))\d{12}$

New

1221009999999999
2121009999999999
2211009999999999
2220009999999999
2221009999999999
2321009999999999
2499999999999999
2720999999999999
2721009999999999
2721999999999999
2730999999999999
2820999999999999
4111111111111111
5055555555555555
5100000000000000
5255555555555555
5444444444444444
5555555555555555
5600000000000000
5911111111111111