Regular Expressions 101

^start of line

Group 1((([1-9]\d{0,2}(,\d{3})*|[1-9]\d*)(\.\d{1,4})?)|[1-9]\d*|(0\.\d{1,4})|0)

1st Alternative(([1-9]\d{0,2}(,\d{3})*|[1-9]\d*)(\.\d{1,4})?)

Group 2(([1-9]\d{0,2}(,\d{3})*|[1-9]\d*)(\.\d{1,4})?)

Group 3([1-9]\d{0,2}(,\d{3})*|[1-9]\d*)

1st Alternative[1-9]\d{0,2}(,\d{3})*

Character Class[1-9]

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

\d{0,2}a digit, repeated between 0 and 2 times

Group 4(,\d{3})*

*repeats the group contents below any number of times:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\d{3}a digit, repeated exactly 3 times

2nd Alternative[1-9]\d*

Character Class[1-9]

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

\d*a digit, repeated any number of times

Group 5(\.\d{1,4})?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,4}a digit, repeated between 1 and 4 times

2nd Alternative[1-9]\d*

Character Class[1-9]

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

\d*a digit, repeated any number of times

3rd Alternative(0\.\d{1,4})

Group 6(0\.\d{1,4})

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,4}a digit, repeated between 1 and 4 times

4th Alternative0

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

$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

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25 tokens

Regular Expression

^((([1-9]\d{0,2}(,\d{3})*|[1-9]\d*)(\.\d{1,4})?)|[1-9]\d*|(0\.\d{1,4})|0)$

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