Regular Expressions 101

Pro

^start of line

Non-Capturing Group(?:(?:[1-4](?:\.\d{1,3})?)|(?:5(?:\.0{1,3})?)|(?:0\.(?:(?:(?:[1-9]\d{0,2}))|(?:0[1-9]\d?)|(?:00[1-9]))))

1st Alternative(?:[1-4](?:\.\d{1,3})?)

Non-Capturing Group(?:[1-4](?:\.\d{1,3})?)

Character Class[1-4]

1-4one character from 1 (49₁₀) to 4 (52₁₀)

Non-Capturing Group(?:\.\d{1,3})?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,3}a digit, repeated between 1 and 3 times

2nd Alternative(?:5(?:\.0{1,3})?)

Non-Capturing Group(?:5(?:\.0{1,3})?)

5the literal 5 (53₁₀ / 65₈ / 35₁₆)

Non-Capturing Group(?:\.0{1,3})?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

0{1,3}the literal 0 (48₁₀ / 60₈ / 30₁₆) , repeated between 1 and 3 times

3rd Alternative(?:0\.(?:(?:(?:[1-9]\d{0,2}))|(?:0[1-9]\d?)|(?:00[1-9])))

Non-Capturing Group(?:0\.(?:(?:(?:[1-9]\d{0,2}))|(?:0[1-9]\d?)|(?:00[1-9])))

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:(?:(?:[1-9]\d{0,2}))|(?:0[1-9]\d?)|(?:00[1-9]))

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

Non-Capturing Group(?:(?:[1-9]\d{0,2}))

Non-Capturing Group(?:[1-9]\d{0,2})

Character Class[1-9]

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

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

2nd Alternative(?:0[1-9]\d?)

Non-Capturing Group(?:0[1-9]\d?)

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

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

\d?optionally matches a digit

3rd Alternative(?:00[1-9])

Non-Capturing Group(?:00[1-9])

00the literal text 00

Character Class[1-9]

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

$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

^(?:(?:[1-4](?:\.\d{1,3})?)|(?:5(?:\.0{1,3})?)|(?:0\.(?:(?:(?:[1-9]\d{0,2}))|(?:0[1-9]\d?)|(?:00[1-9]))))$

New

Extraction