Last Updated：2025/12/04

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(regular expressions) The analysis of the subsequent characters presence before the regular expression is matched (symbol: ?=).

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positive lookahead

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Source Word

positive lookahead

Noun

countable uncountable

(regular expressions) The analysis of the subsequent characters presence before the regular expression is matched (symbol: ?=).

Japanese Meaning

正規表現において、パターンがマッチする前に後続の文字列が存在するかを検証する手法。 / 正規表現で実際に文字列を消費せず、次の文字が特定のパターンに一致するかを確認する仕組み（シンボル：?=）。

What is this buttons?

When debugging the regex, I used a positive lookahead to ensure the next characters matched 'abc' without consuming them.

Google Translation / DeepL Translation

正規表現をデバッグするとき、次に続く文字が消費されることなく「abc」と一致することを確認するために肯定の先読み（構文: ?=）を使いました。

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Sense（1）

(regular expressions) The analysis of the subsequent characters presence before the regular expression is matched (symbol: ?=).

Negative lookahead works just like positive lookahead, except that whereas positive lookahead matches when the regex inside the lookahead matches, negative lookahead matches when the regex inside the lookahead failed to match.

Google Translation / DeepL Translation

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positive lookaheads

（ plural ）

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positive lookahead

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positive lookahead

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