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[英]How to create a regex that checks the string contains specific pattern in javascript?
[英]JavaScript RegEx: How to create a RegEx pattern using a specific value from a Variable?
我有這個變量:
var search = "dummy";
var replace = "<strong>" + search + "</strong>";
var contents = "my contents are here and this dummy value should be bolded...";
contents.replace(/search/gi, replace);
因此,如何在RegEx模式下設置此“搜索”變量,然后為我的匹配設置/ gi設置。
嘗試
new RegExp('yourSearchHere', 'gi');
您還應該意識到以下事實:必須轉義某些序列。 順便說一句。 在構造這樣的正則表達式時,必須將它們加倍轉義(新的RegExp('\\\\ n')->匹配\\ n)
您還可以使用RegExp對象創建正則表達式:
search = "dummy";
x = new RegExp(search,"gi");
var search = "dummy";
var replace = "<strong>" + search + "</strong>";
var contents = "my contents are here and this dummy value should be bolded...";
window.alert(contents.replace(x, replace));
您可以使用反向引用 :$ 1會記住您與正則表達式匹配的內容。 這樣做是因為您要搜索的單詞放在組成捕獲組的圓括號內。
var contents = "my contents are here and this dummy value should be bolded...";
function makeStronger( word, str ) {
var rxp = new RegExp( '(' + word +')', 'gi' );
return str.replace( rxp, '<strong>$1<\/strong>' );
}
console.log( makeStronger( 'dummy', contents ) );
// my contents are here and this <strong>dummy</strong> value should be bolded...
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