Text Processingflags: g

Sentence Boundary

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

Try it in RegexPro

Pattern

regexJavaScript
/[.!?]\s+(?=[A-Z])/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 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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