Numbers

Scientific Notation

Matches numbers in scientific/exponential notation (e.g., 1.5e10).

Try it in RegexPro →

Available in

JSSupported

JavaScript / ECMAScript

Browser-native RegExp. Default if you don't pick.

PYSupported

Python (re)

CPython stdlib `re`. Unicode-aware `\w` and `\d` by default.

GOSupported

Go (RE2)

Linear-time matching. No backreferences or lookarounds.

Pattern

regexengine-agnostic
^-?\d+(\.\d+)?[eE][+-]?\d+$

Raw source: ^-?\d+(\.\d+)?[eE][+-]?\d+$

How it works

`^-?\d+(\.\d+)?` matches a signed decimal. `[eE]` allows either exponent marker. `[+-]?\d+$` matches the signed exponent digits.

Examples

Input

1.5e10

Matches

  • 1.5e10

Input

-2.7E-5

Matches

  • -2.7E-5

Input

3.14

No match

—

Common use cases

  • •Scientific computing
  • •Data import
  • •Numeric parsing

Related patterns

Float / Scientific Number

Numbers

Match floating-point and scientific-notation numbers including `1.5`, `.25`, `1e10`, `-3.14E-2`.

Decimal Number

Numbers

Matches decimal numbers, including integers and negatives.

Integer

Numbers

Matches whole integers, including negative numbers.

Binary Number Literal

Numbers

Match binary number literals like `0b1010` or `0B11110000`.

←PreviousPercentage
All patterns
NextUnix File Path→