Numbersflags: g

Float / Scientific Number

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

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*|\.\d+)(?:[eE][-+]?\d+)?   (flags: g)

Raw source: [-+]?(?:\d+\.?\d*|\.\d+)(?:[eE][-+]?\d+)?

How it works

[-+]? matches an optional sign. (?:\d+\.?\d*|\.\d+) matches the mantissa as either digits-with-optional-decimal or decimal-with-trailing-digits. (?:[eE][-+]?\d+)? matches the optional exponent. Covers most real-number literals you'll encounter in source or data.

Examples

Input

h = 6.626e-34, c = 3e8, alpha = .007

Matches

  • 6.626e-34
  • 3e8
  • .007

Input

Range -1.5 to +2.5

Matches

  • -1.5
  • +2.5

Input

no numbers here

No match

—

Common use cases

  • •Scientific-notation parsing in CSV/log data
  • •Source-code analysis (constants extraction)
  • •Lexer tooling for math DSLs
  • •Data validation in physics / finance pipelines
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