Regular Expressions 101

^start of line

Character Class[\-]?

?matches at most one character from the set below:

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d*a digit, repeated any number of times

Character Class[\.]?

?matches at most one character from the set below:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[\d]*

*matches any number of characters from the set below:

\da 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.

Search reference

Regular Expression

^[\-]?\d*[\.]?[\d]*$

0.23455465
4.54656
-334343
-.34234234
234234.4234234
23123
323-312312
-12121.34344
asdasd
2312
213.3213.3213