Text Processingflags: g

Negative Lookbehind (Decimals Without $)

Use negative lookbehind `(?<!...)` to match decimal numbers NOT preceded by a dollar sign.

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.

GOSee workaround

Go (RE2)

Linear-time matching. No backreferences or lookarounds.

Pattern

regexengine-agnostic
(?<!\$)\b\d+\.\d{2}\b   (flags: g)

Raw source: (?<!\$)\b\d+\.\d{2}\b

How it works

(?<!\$) is a zero-width assertion that succeeds only when the position is NOT preceded by `$`. \b\d+\.\d{2}\b then matches a decimal with exactly two fractional digits. JS and Python both support negative lookbehind; Go's RE2 does NOT support any lookbehind at all.

Examples

Input

Price $19.99 vs ratio 1.50

Matches

  • 1.50

Input

Discount 10.00 off $99.99

Matches

  • 10.00

Input

$5.00 only

No match

—

Common use cases

  • •Extracting non-currency decimals from financial text
  • •Linting rules that ignore certain prefixes
  • •Filtering URL paths that don't begin with a marker
  • •Selective text replacement avoiding marked tokens

Related patterns

Negative Lookahead

Text Processing

Use negative lookahead `(?!...)` to match words that are NOT in a blocklist (here: log-level keywords).

JSON Key-Value Pair (Simple)

Text Processing

Extract simple `"key": value` pairs from JSON-ish text (strings, numbers, booleans, null).

JSON Number (Strict)

Text Processing

Match JSON-spec numbers — disallows leading zeros (no `01`), allows decimals and exponents.

Non-Capturing Group (Image URL)

Text Processing

Use non-capturing groups `(?:...)` to alternate without polluting the captured-groups list.

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