Regular Expressions 101

^start of string

Group 1([0-9]+.?[0-9]*|[0-9]*.?[0-9]+)

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

Character Class[0-9]+

+matches at least one character from the set below:

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

.?optionally matches any character (except for line terminators)

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]*.?[0-9]+

Character Class[0-9]*

*matches any number of characters from the set below:

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

.?optionally matches any character (except for line terminators)

Character Class[0-9]+

+matches at least one character from the set below:

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

Group 2(["\'])?

?repeats the group contents below at most once:

Character Class["\']

"the literal " (34₁₀ / 42₈ / 22₁₆)

\'the literal ' (39₁₀ / 47₈ / 27₁₆)

$end of string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^([0-9]+.?[0-9]*|[0-9]*.?[0-9]+)(["\'])?$

New

2
2.2
2"
2'
2.3"
2.4"
2'
2.
2'2"