Regular Expressions 101

Explanation

Pro

^start of string

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

Group 1([\+\-]?)

Character Class[\+\-]?

?matches at most one character from the set below:

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

Atomic Group(?>([0-9]+)[.,]?([0-9]*)|[.,]?([0-9]+))

1st Alternative([0-9]+)[.,]?([0-9]*)

Group 2([0-9]+)

Character Class[0-9]+

+matches at least one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Character Class[.,]?

?matches at most one character from the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Group 3([0-9]*)

Character Class[0-9]*

*matches any number of characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

2nd Alternative[.,]?([0-9]+)

Character Class[.,]?

?matches at most one character from the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Group 4([0-9]+)

Character Class[0-9]+

+matches at least one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

%?optionally matches the literal % (37₁₀ / 45₈ / 25₁₆)

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

$end of string, or before its final line terminator

Ready to run

25 tokens

^ *([\+\-]?) *(?>([0-9]+)[.,]?([0-9]*)|[.,]?([0-9]+)) *%? *$