Javascript 正则表达式从字符串的末尾获取数字
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regex to get the number from the end of a string
提问by Saurabh Kumar
i have a id like stringNumber variable like the one as follows : example12 I need some javascript regex to extract 12 from the string."example" will be constant for all id and just the number will be different.
我有一个像 stringNumber 这样的 id 变量，如下所示：example12 我需要一些 javascript 正则表达式来从字符串中提取 12。“example”对于所有 id 都是常量，只是数字会有所不同。
回答by alex
This regular expression matches numbers at the end of the string.
此正则表达式匹配字符串末尾的数字。
var matches = str.match(/\d+$/);
It will return an Arraywith its 0th element the match, if successful. Otherwise, it will return null.
如果成功，它将返回Array带有第0th 个元素的匹配项。否则，它将返回null。
Before accessing the 0member, ensure the match was made.
在访问0成员之前，请确保已进行匹配。
if (matches) {
number = matches[0];
}
If you must have it as a Number, you can use a function to convert it, such as parseInt().
如果必须将其作为 . Number，则可以使用函数将其转换，例如parseInt().
number = parseInt(number, 10);
回答by jensgram
RegEx:
正则表达式：
var str = "example12";
parseInt(str.match(/\d+$/)[0], 10);
String manipulation:
字符串操作：
var str = "example12",
prefix = "example";
parseInt(str.substring(prefix.length), 10);
