Regular Expressions 101

Pro

^start of line

Positive Lookahead(?=.*\d)

.*any character (except for line terminators), repeated any number of times

\da digit

\d*a digit, repeated any number of times

Character Class[.:]?

?matches at most one character from the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\d*a digit, repeated any number of 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.

25 tokens

^(?=.*\d)\d*[.:]?\d*$

New

87887
8787.878
8878:98
.1
1.

abc
989ab
8987.89:87

87887
8787.878
8878:98
.1
1.

abc
989ab
8987.89:87