Text Processingflags: g

Python f-String Expression

Match `{expression}` placeholders inside Python f-strings (or any single-brace template syntax).

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
\{([^{}]+)\}   (flags: g)

Raw source: \{([^{}]+)\}

How it works

\{ matches the literal opening brace. ([^{}]+) captures one or more characters that are NOT another brace — this avoids accidentally matching `{{` (the literal-brace escape in f-strings) and prevents nested-brace headaches. \} matches the closing brace.

Examples

Input

f"Hello {name}, you are {age} years old"

Matches

  • {name}
  • {age}

Input

f"Total: {amount:.2f} USD"

Matches

  • {amount:.2f}

Input

f"escaped {{ not a placeholder }}"

No match

—

Common use cases

  • •Static analysis of f-string usage
  • •Linting for unsafe expressions in templates
  • •Translating f-strings to .format() during downgrades
  • •Generating docs from template files

Related patterns

Triple-Quoted String (Python / TS)

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Match triple-quoted strings (Python docstrings, TypeScript triple-quote, etc.) including newlines.

JavaScript Template Literal Placeholder

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Match `${expression}` placeholders inside JavaScript template literals.

Base64 String

Text Processing

Match Base64-encoded strings, including proper padding with = and == characters.

Python Import Statement

Text Processing

Match Python `import x` and `from x import y` statements, capturing the module and target.

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