常見例句Positive lookahead and lookbehind do not backtrack. 積極的預(yù)測先行和追溯不廻溯。The biggest limitation is that yacc is limited to one token of lookahead. 最大的侷限在於,yacc被限定爲(wèi)一個預(yù)讀標(biāo)記。This “l(fā)ookahead” into cool/hot spot movement is supplied to you each turn. 這些對於冷/熱場的的移動信息在每次移動之前會提供給你。Provides information about regular expression lookahead and lookbehind behavior. 提供關(guān)於正則表達(dá)式預(yù)測先行和追溯行爲(wèi)的信息。Assertions do not change: lookahead looks to the right; lookbehind looks to the left. 斷言不改變:預(yù)測先行曏右搜索;廻顧後發(fā)曏左搜索。Our eyes are placed in front because it's more important to lookahead than to look back. 我們的眼睛長在前麪是因爲(wèi)曏前看比曏後看更重要.;如果你曏後看 返回 lookahead