Regular Expressions 101

Pro

^start of line

Negative Lookahead(?!\.$)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

$end of line

\d{0,10}a digit, repeated between 0 and 10 times

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

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

?repeats the group contents below at most once:

\da digit

\d?optionally matches a digit

$end of line

Global pattern flags

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

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

Detailed match information will be displayed here automatically.

25 tokens

^(?!\.$)\d{0,10}(?:\.(?:\d\d?)?)?$

New

1.23
12345
0
123
1234567890
12345678901
1234.
0.
1234567890.12
1234567890.123
.1
.12
.123
.
123.123
123.12

1.23
12345
0
123
1234567890
12345678901
1234.
0.
1234567890.12
1234567890.123
.1
.12
.123
.
123.123
123.12