What is the regex pattern for decimal number?

The regex pattern for decimal number is: ^-?\d+\.\d+$.

How does the decimal number regex work?

^: Start of string. -?: Optional minus sign. \d+: One or more digits (whole part). \.: Literal decimal point. \d+: One or more digits (fractional part). $: End of string.

Regex for Decimal Number

Matches positive and negative decimal numbers with a required fractional part.

Pattern

/^-?\d+\.\d+$/

Pattern Breakdown

Token	Explanation
^	Start of string
-?	Optional minus sign
\d+	One or more digits (whole part)
\.	Literal decimal point
\d+	One or more digits (fractional part)
$	End of string

Test Examples

Input	Match?
3.14	Match
-0.5	Match
100.00	Match
42	No match
.5	No match

Common Use Cases

Price validation
Scientific data input
Measurement values

Variations

^-?\d*\.?\d+$

Optional decimal point (matches integers too)

Other Regex Patterns

Email Address US Phone Number International Phone Number URL IPv4 Address IPv6 Address Date (MM/DD/YYYY)Date (ISO 8601 YYYY-MM-DD)Time (HH:MM, 24-hour)Credit Card Number US Social Security Number US ZIP Code

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