Regular Expressions 101

Pro

Group 1((?:kilograms?|kilos?|kg)|(?:\d{0,4}(?:\.\d{1,6})))

1st Alternative(?:kilograms?|kilos?|kg)

Non-Capturing Group(?:kilograms?|kilos?|kg)

1st Alternativekilograms?

kilogramthe literal text kilogram (case sensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

2nd Alternativekilos?

kilothe literal text kilo (case sensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

3rd Alternativekg

kgthe literal text kg (case sensitive)

2nd Alternative(?:\d{0,4}(?:\.\d{1,6}))

Non-Capturing Group(?:\d{0,4}(?:\.\d{1,6}))

\d{0,4}a digit, repeated between 0 and 4 times

Non-Capturing Group(?:\.\d{1,6})

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,6}a digit, repeated between 1 and 6 times

\s*any whitespace character, repeated any number of times

Group 2((?:kilograms?|kilos?|kg)|(?:\d{0,4}(?:\.\d{1,6})))

1st Alternative(?:kilograms?|kilos?|kg)

Non-Capturing Group(?:kilograms?|kilos?|kg)

1st Alternativekilograms?

kilogramthe literal text kilogram (case sensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

2nd Alternativekilos?

kilothe literal text kilo (case sensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

3rd Alternativekg

kgthe literal text kg (case sensitive)

2nd Alternative(?:\d{0,4}(?:\.\d{1,6}))

Non-Capturing Group(?:\d{0,4}(?:\.\d{1,6}))

\d{0,4}a digit, repeated between 0 and 4 times

Non-Capturing Group(?:\.\d{1,6})

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,6}a digit, repeated between 1 and 6 times

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

((?:kilograms?|kilos?|kg)|(?:\d{0,4}(?:\.\d{1,6})))\s*((?:kilograms?|kilos?|kg)|(?:\d{0,4}(?:\.\d{1,6})))

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