CODEWITHSUNDEEP
c#.netregex
user1590636
user1590636

Reputation: 1194

How do I parse a double with optional decimal seperator

i want to parse numbers with unit like

3cm
3.44 cm
12,33  mm

the following expression does exactly what i want

(([0-9]*(?:[,.]?[0-9]*?))[\s]*(cm|mm))

but the problem is it also matches things like

cm 22.1   cm

in this case it ignores the number and matches the first cm only, how do i ignore the first cm?

Upvotes: 0

Views: 41

Answers (3)

Avinash Raj
Avinash Raj

Reputation: 174706

Like others said, you need to change the quantifier * to + where * represents zero or more and + represents one or more. If you want to match also the numbers like 12,533.45 cm, then you could use the below regex.

[0-9]+(?:,[0-9]+)*(?:\.[0-9]+)?\s*(?:cm|mm)

DEMO

Upvotes: 1

dotnetom
dotnetom

Reputation: 24901

You can update the first number match quantifier from zero or more (*) to one or more (+):

(([0-9]+(?:[,.]?[0-9]*?))[\s]*(cm|mm))

Upvotes: 2

vks
vks

Reputation: 67968

\d+(?:[.,]\d+)?\s*(?:cm|mm)

Try this.See demo.

https://regex101.com/r/qJ8qW5/2

Upvotes: 1

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