Regular Expressions 101

^start of line

Non-Capturing Group(?:1[0]{11}|\d{1,11})?

?repeats the group contents below at most once:

1st Alternative1[0]{11}

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0]{11}

{11}matches exactly 11 characters from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

2nd Alternative\d{1,11}

\d{1,11}a digit, repeated between 1 and 11 times

Non-Capturing Group(?:\.\d{1,2})?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,2}a digit, repeated between 1 and 2 times

$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.

Search reference

Regular Expression

^(?:1[0]{11}|\d{1,11})?(?:\.\d{1,2})?$

New

100000000000.11
000000000000
99999999999
99999999999.a
99999999999.1
99999999999.22
299999999991.22
1000
.77