使用正则表达式提取两个字符串之间的字符串

Question

我正在抓取一个网站，我想使用 Python Regex 在以下 JS 代码中提取 data 变量的 JSON。

<script type="text/javascript">
P.when('A').register("ImageBlockATF", function(A){
    var data = {
                'colorImages': { 'initial': [{"hiRes":"https://images-na.ssl-images-amazon.com/images/I/81Oo79kGp2L._SL1500_.jpg","thumb":"https://images-na.ssl-images-amazon.com/images/I/41SnVVzKChL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/41SnVVzKChL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/81Oo79kGp2L._SY355_.jpg":[355,270],"https://images-na.ssl-images-amazon.com/images/I/81Oo79kGp2L._SY450_.jpg":[450,342],"https://images-na.ssl-images-amazon.com/images/I/81Oo79kGp2L._SY550_.jpg":[550,419],"https://images-na.ssl-images-amazon.com/images/I/81Oo79kGp2L._SY606_.jpg":[606,461],"https://images-na.ssl-images-amazon.com/images/I/81Oo79kGp2L._SY679_.jpg":[679,517]},"variant":"MAIN","lowRes":null},{"hiRes":"https://images-na.ssl-images-amazon.com/images/I/81%2BGc-r4gLL._SL1500_.jpg","thumb":"https://images-na.ssl-images-amazon.com/images/I/416rXB0xcmL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/416rXB0xcmL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/81%2BGc-r4gLL._SY355_.jpg":[355,276],"https://images-na.ssl-images-amazon.com/images/I/81%2BGc-r4gLL._SY450_.jpg":[450,349],"https://images-na.ssl-images-amazon.com/images/I/81%2BGc-r4gLL._SX425_.jpg":[547,425],"https://images-na.ssl-images-amazon.com/images/I/81%2BGc-r4gLL._SX466_.jpg":[600,466],"https://images-na.ssl-images-amazon.com/images/I/81%2BGc-r4gLL._SX522_.jpg":[672,522]},"variant":"PT01","lowRes":null},{"hiRes":"https://images-na.ssl-images-amazon.com/images/I/817slrgsGbL._SL1500_.jpg","thumb":"https://images-na.ssl-images-amazon.com/images/I/51gQxeLTYhL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/51gQxeLTYhL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/817slrgsGbL._SX355_.jpg":[251,355],"https://images-na.ssl-images-amazon.com/images/I/817slrgsGbL._SX450_.jpg":[318,450],"https://images-na.ssl-images-amazon.com/images/I/817slrgsGbL._SX425_.jpg":[300,425],"https://images-na.ssl-images-amazon.com/images/I/817slrgsGbL._SX466_.jpg":[329,466],"https://images-na.ssl-images-amazon.com/images/I/817slrgsGbL._SX522_.jpg":[369,522]},"variant":"PT02","lowRes":null},{"hiRes":"https://images-na.ssl-images-amazon.com/images/I/71r3nXKZBmL._SL1500_.jpg","thumb":"https://images-na.ssl-images-amazon.com/images/I/41d9m8J4MbL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/41d9m8J4MbL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/71r3nXKZBmL._SX355_.jpg":[142,355],"https://images-na.ssl-images-amazon.com/images/I/71r3nXKZBmL._SX450_.jpg":[180,450],"https://images-na.ssl-images-amazon.com/images/I/71r3nXKZBmL._SX425_.jpg":[170,425],"https://images-na.ssl-images-amazon.com/images/I/71r3nXKZBmL._SX466_.jpg":[187,466],"https://images-na.ssl-images-amazon.com/images/I/71r3nXKZBmL._SX522_.jpg":[209,522]},"variant":"PT03","lowRes":null},{"hiRes":"https://images-na.ssl-images-amazon.com/images/I/81Uys4ccU4L._SL1500_.jpg","thumb":"https://images-na.ssl-images-amazon.com/images/I/41zh%2BCGamHL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/41zh%2BCGamHL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/81Uys4ccU4L._SY355_.jpg":[355,260],"https://images-na.ssl-images-amazon.com/images/I/81Uys4ccU4L._SY450_.jpg":[450,330],"https://images-na.ssl-images-amazon.com/images/I/81Uys4ccU4L._SY550_.jpg":[550,403],"https://images-na.ssl-images-amazon.com/images/I/81Uys4ccU4L._SY606_.jpg":[606,444],"https://images-na.ssl-images-amazon.com/images/I/81Uys4ccU4L._SY679_.jpg":[679,498]},"variant":"PT04","lowRes":null},{"hiRes":"https://images-na.ssl-images-amazon.com/images/I/8179KoLoyGL._SL1500_.jpg","thumb":"https://images-na.ssl-images-amazon.com/images/I/41sMHp-WegL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/41sMHp-WegL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/8179KoLoyGL._SY355_.jpg":[355,258],"https://images-na.ssl-images-amazon.com/images/I/8179KoLoyGL._SY450_.jpg":[450,327],"https://images-na.ssl-images-amazon.com/images/I/8179KoLoyGL._SY550_.jpg":[550,400],"https://images-na.ssl-images-amazon.com/images/I/8179KoLoyGL._SY606_.jpg":[606,441],"https://images-na.ssl-images-amazon.com/images/I/8179KoLoyGL._SY679_.jpg":[679,494]},"variant":"PT05","lowRes":null},{"hiRes":"https://images-na.ssl-images-amazon.com/images/I/71Sw2wrvy6L._SL1364_.jpg","thumb":"https://images-na.ssl-images-amazon.com/images/I/416TFrjOFlL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/416TFrjOFlL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/71Sw2wrvy6L._SX355_.jpg":[231,355],"https://images-na.ssl-images-amazon.com/images/I/71Sw2wrvy6L._SX450_.jpg":[293,450],"https://images-na.ssl-images-amazon.com/images/I/71Sw2wrvy6L._SX425_.jpg":[277,425],"https://images-na.ssl-images-amazon.com/images/I/71Sw2wrvy6L._SX466_.jpg":[304,466],"https://images-na.ssl-images-amazon.com/images/I/71Sw2wrvy6L._SX522_.jpg":[340,522]},"variant":"PT06","lowRes":null},{"hiRes":"https://images-na.ssl-images-amazon.com/images/I/61GKBhtPKPL._SL1341_.jpg","thumb":"https://images-na.ssl-images-amazon.com/images/I/41%2BNMI0l9yL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/41%2BNMI0l9yL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/61GKBhtPKPL._SX355_.jpg":[190,355],"https://images-na.ssl-images-amazon.com/images/I/61GKBhtPKPL._SX450_.jpg":[240,450],"https://images-na.ssl-images-amazon.com/images/I/61GKBhtPKPL._SX425_.jpg":[227,425],"https://images-na.ssl-images-amazon.com/images/I/61GKBhtPKPL._SX466_.jpg":[249,466],"https://images-na.ssl-images-amazon.com/images/I/61GKBhtPKPL._SX522_.jpg":[279,522]},"variant":"PT07","lowRes":null},{"hiRes":null,"thumb":"https://images-na.ssl-images-amazon.com/images/I/41ziorm06nL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/41ziorm06nL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/41ziorm06nL._SY355_.jpg":[355,266],"https://images-na.ssl-images-amazon.com/images/I/41ziorm06nL._SY450_.jpg":[450,338],"https://images-na.ssl-images-amazon.com/images/I/41ziorm06nL.jpg":[500,375]},"variant":"AW01","lowRes":null},{"hiRes":null,"thumb":"https://images-na.ssl-images-amazon.com/images/I/41lZ6jtPe%2BL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/41lZ6jtPe%2BL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/41lZ6jtPe%2BL._SY355_.jpg":[355,266],"https://images-na.ssl-images-amazon.com/images/I/41lZ6jtPe%2BL._SY450_.jpg":[450,338],"https://images-na.ssl-images-amazon.com/images/I/41lZ6jtPe%2BL.jpg":[500,375]},"variant":"AW02","lowRes":null},{"hiRes":null,"thumb":"https://images-na.ssl-images-amazon.com/images/I/51JqQcNGjUL._SS40_.jpg","large":"https://images-na.ssl-images-amazon.com/images/I/51JqQcNGjUL.jpg","main":{"https://images-na.ssl-images-amazon.com/images/I/51JqQcNGjUL._SY355_.jpg":[355,355],"https://images-na.ssl-images-amazon.com/images/I/51JqQcNGjUL._SY450_.jpg":[450,450],"https://images-na.ssl-images-amazon.com/images/I/51JqQcNGjUL._SX425_.jpg":[425,425],"https://images-na.ssl-images-amazon.com/images/I/51JqQcNGjUL._SX466_.jpg":[466,466],"https://images-na.ssl-images-amazon.com/images/I/51JqQcNGjUL.jpg":[500,500]},"variant":"AW03","lowRes":null}]},
                'colorToAsin': {'initial': {}},
                'holderRatio': 1.0,
                'holderMaxHeight': 700,
                'heroImage': {'initial': []},
                'weblabs' : {}
                };
    A.trigger('P.AboveTheFold'); // trigger ATF event.
    return data;
});
</script>

我一直在尝试遵循正则表达式但不工作。

(var\s+data\s+=).*^[A.trigger('P.AboveTheFold')]$

基本上我需要正则表达式来抓取var data = 和A.trigger('P.AboveTheFold') 之间的字符串

Answer 1

如果你确定你的 json 数据不包含任何;，你可以写：

var data\s*=\s*([^;]*});

它不是很健壮，您可能应该使用解析库。 json数据在第一组内。

看here。

如果您确定您的数据在var data = 和A.trigger('P.AboveTheFold') 之间，您可以使用：

(?<=var data = ).*(?=A.trigger\('P\.AboveTheFold'\))

看there。

json 数据是完全匹配的，这要归功于积极的环视。 它也不健壮。例如， data 和 = 之间的任何不同间距都会破坏它。您需要 re.DOTALL 标志来告诉 Python . 应该匹配换行符。