Regular Expressions 101

Pro

Non-Capturing Group(?:(?:V\d{1,2}\.\d{1,2})|(?:\d{1,3}\.\d{1,2})|(?:E\d{1,2}\.\d+))

1st Alternative(?:V\d{1,2}\.\d{1,2})

Non-Capturing Group(?:V\d{1,2}\.\d{1,2})

Vthe literal V (86₁₀ / 126₈ / 56₁₆) (case insensitive)

\d{1,2}a digit, repeated between 1 and 2 times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,2}a digit, repeated between 1 and 2 times

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

Non-Capturing Group(?:\d{1,3}\.\d{1,2})

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,2}a digit, repeated between 1 and 2 times

3rd Alternative(?:E\d{1,2}\.\d+)

Non-Capturing Group(?:E\d{1,2}\.\d+)

Ethe literal E (69₁₀ / 105₈ / 45₁₆) (case insensitive)

\d{1,2}a digit, repeated between 1 and 2 times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

Negative Lookahead(?!\d|(?:\s*(?:kg|lb|mg)s?))

1st Alternative\d

\da digit

2nd Alternative(?:\s*(?:kg|lb|mg)s?)

Non-Capturing Group(?:\s*(?:kg|lb|mg)s?)

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

Non-Capturing Group(?:kg|lb|mg)

1st Alternativekg

kgthe literal text kg (case insensitive)

2nd Alternativelb

lbthe literal text lb (case insensitive)

3rd Alternativemg

mgthe literal text mg (case insensitive)

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

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

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25 tokens

(?:(?:V\d{1,2}\.\d{1,2})|(?:\d{1,3}\.\d{1,2})|(?:E\d{1,2}\.\d+))(?!\d|(?:\s*(?:kg|lb|mg)s?))

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