Regular Expressions 101

^start of string

\s*any whitespace character, repeated any number of times

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\s*any whitespace character, repeated any number of times

$end of string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^\s*:\s*$

New

0
0.0 // less than lower bound
0.19 // fraction part is 2 digits, right '9' is extra
94.11-2.32 // fraction part is 2 digits, right '1' is extra
999.90 // fraction part is 2 digits, '0' is extra
9.0 // should be 9 or 9.1, 9.0 is wrong
1000

0.1
1.1
55.5
999.9

2.0:2.2
:a

Regular Expression

Substitution