In my string labeled as 'content', I have the phrase "data-RowKey=xxx" embedded within it. I attempted to extract the 'xxx' portion using the code snippet below:
var val = content.substring(12 + content.indexOf("data-RowKey="), 3);
Unfortunately, this approach was unsuccessful. Instead of retrieving only three characters, I ended up with a lengthy string. Could someone identify the error in my code?
If you're looking to capture data that fits a specific pattern, it's important to use regular expressions. For example, if your data consists of exactly three symbols, you would use the regular expression /data-RowKey=(...)/, where the period . represents any symbol and the parentheses () indicate the part to capture.
.substring() [W3C] function requires two parameters for extracting a part of a string, while .substr() [W3C] function needs an index and a length. See the example below:
var val = text.substr(6 + text.indexOf("data-Value="), 4);
When "data-Value=123" is the complete string, there are alternative methods to retrieve 123:
var val = text.replace('data-Value=', '');
var val = text.split('=')[1]; // assuming `=` is not present in 123
Check out this solution:
var result = input.match(/data-Attribute=(.*)/)[1];
For cases where there are additional characters after the xxx, you can use this approach:
"data-Attribute=123abc".match(/data-Attribute=(.{3}).*/)[1] // 123
To optimize performance with numeric rowkeys, it's best to retrieve the number as an integer upfront without requiring conversion later:
let value = parseInt(content.split("data-RowKey=")[1]);
If the rowkey is consistently three characters or do not require conversion, you can simply extract the substring:
let value = content.split("data-RowKey=")[1].substring(0,3);
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