[英]Javascript regex to extract variables
I have a string in Javascript that contains variables with the format ${var-name}
. 我在Javascript中有一个字符串,其中包含格式
${var-name}
变量。 For example: 例如:
'This is a string with ${var1} and ${var2}'
I need to get these variables in an array: ['var1','var2']
. 我需要在数组中获取这些变量:
['var1','var2']
。
Is this possible with regex? 正则表达式可能吗?
Have a try with: 尝试一下:
/\$\{(\w+?)\}/
Running example, many thanks to @RGraham : 运行示例,非常感谢@RGraham:
var regex = new RegExp(/\$\{(\w+?)\}/g),
text = "This is a string with ${var1} and ${var2} and {var3}",
result,
out = [];
while(result = regex.exec(text)) {
out.push(result[1]);
}
console.log(out);
This regex - \\${([^\\s}]+)(?=})
- should work. 此正则表达式 -
\\${([^\\s}]+)(?=})
-应该可以正常工作。
Explanation: 说明:
\\${
- Match literal ${
\\${
-匹配文字${
([^\\s}]+)
- A capture group that will match 1 or more character that are not whitespace or literal }
. ([^\\s}]+)
-一个捕获组,将匹配一个或多个非空格或文字}
字符。 (?=})
- A positive look-ahead that will check if we finally matched a literal }
. (?=})
-积极的前瞻性,它将检查我们是否最终匹配了文字}
。 Here is sample code: 这是示例代码:
var re = /\\${([^\\s}]+)(?=})/g; var str = 'This is a string with ${var1} and ${var2} and {var3}'; var arr = []; while ((m = re.exec(str)) !== null) { arr.push(m[1]); } alert(arr);
var str = 'This is a string with ${var1} and ${var2}';
var re = /\$\{(\w+?)\}/g;
var arr = [];
var match;
while (match = re.exec(str)) {
arr.push(match[1]);
}
console.log(arr);
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