Python (re)

Scientific Notation in PY

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

Pattern

regexPY

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

pyPython

import re

pattern = re.compile(r"^-?\d+(\.\d+)?[eE][+-]?\d+$")
input_text = "1.5e10"
for m in pattern.finditer(input_text):
    print(m.group(0))

Stdlib `re` module — no third-party dependency. Works on Python 3.6+.

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

Input

1.5e10

Matches

Input

-2.7E-5

Matches

Input

3.14

No match

—

See how this pattern looks (and behaves) in JavaScript's built-in RegExp.

See how this pattern looks (and behaves) in Go's `regexp` package (RE2 engine).