Text Processingflags: g

Sentence Boundary

Matches sentence boundaries (punctuation followed by whitespace and a capital letter).

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
[.!?]\s+(?=[A-Z])   (flags: g)

Raw source: [.!?]\s+(?=[A-Z])

How it works

`[.!?]` matches terminating punctuation. `\s+` matches whitespace. `(?=[A-Z])` is a lookahead for a capital letter (marks where the next sentence begins).

Examples

Input

Hello world. How are you? I'm fine!

Matches

  • .
  • ?

Common use cases

  • •Sentence splitting
  • •NLP preprocessing
  • •Reading-level analysis

Related patterns

Word Boundary (Whole Word Match)

Text Processing

Match the whole word `cat` without matching it inside other words like `concatenate` or `category`.

Hashtag

Text Processing

Match hashtags (# followed by word characters) in social media posts, including accented Latin characters.

JSON Boolean / Null Literal

Text Processing

Match JSON `true`, `false`, and `null` literal values, with word boundaries to avoid partial matches.

Positive Lookahead (Password)

Text Processing

Use positive lookahead `(?=...)` to require the password contain at least one digit and one uppercase letter.

Related concepts

How to Match Whitespace in Regex

How-to

\s matches any whitespace — space, tab, newline, and more. Use \s+ to collapse runs, ^\s*$ to detect blank lines, and \S for non-whitespace.

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