Regular Expressions 101

Pro

^start of line

Group 1(.*?)

.*?any character (except for line terminators), repeated any number of times

\s?optionally matches any whitespace character

Branch Reset Group(?|(?:dek[ae]t\s(.+)\sradius\s(\d+(?:\.\d+)?)\s?(k?m))|(?:dek[ae]t\s(.+)))

1st Alternative(?:dek[ae]t\s(.+)\sradius\s(\d+(?:\.\d+)?)\s?(k?m))

Non-Capturing Group(?:dek[ae]t\s(.+)\sradius\s(\d+(?:\.\d+)?)\s?(k?m))

dekthe literal text dek (case insensitive)

Character Class[ae]

athe literal a (97₁₀ / 141₈ / 61₁₆) (case insensitive)

ethe literal e (101₁₀ / 145₈ / 65₁₆) (case insensitive)

tthe literal t (116₁₀ / 164₈ / 74₁₆) (case insensitive)

\sany whitespace character

Group 2(.+)

.+any character (except for line terminators), repeated at least once

\sany whitespace character

radiusthe literal text radius (case insensitive)

\sany whitespace character

Group 3(\d+(?:\.\d+)?)

\d+a digit, repeated at least once

Non-Capturing Group(?:\.\d+)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

\s?optionally matches any whitespace character

Group 4(k?m)

k?optionally matches the literal k (107₁₀ / 153₈ / 6B₁₆) (case insensitive)

mthe literal m (109₁₀ / 155₈ / 6D₁₆) (case insensitive)

2nd Alternative(?:dek[ae]t\s(.+))

Non-Capturing Group(?:dek[ae]t\s(.+))

dekthe literal text dek (case insensitive)

Character Class[ae]

athe literal a (97₁₀ / 141₈ / 61₁₆) (case insensitive)

ethe literal e (101₁₀ / 145₈ / 65₁₆) (case insensitive)

tthe literal t (116₁₀ / 164₈ / 74₁₆) (case insensitive)

\sany whitespace character

Group 2(.+)

.+any character (except for line terminators), repeated at least once

Global pattern flags

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

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

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

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25 tokens

^(.*?)\s?(?|(?:dek[ae]t\s(.+)\sradius\s(\d+(?:\.\d+)?)\s?(k?m))|(?:dek[ae]t\s(.+)))

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