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I have a string that and I am trying to extract the characters before the quote.
Example is extract the 14 from 14' - €14.99
I am using the follwing code to acheive this.
$menuItem.text().match(/[^']*/)[0] My problem is that if the string is something like €0.88 I wish to get an empty string returned. However I get back the full string of €0.88.
What I am I doing wrong with the match?
501
Use the substring() method to get the substring before a specific character, e.g. const before = str. substring(0, str. indexOf('_')); . The substring method will return a new string containing the part of the string before the specified character.
The substr() method extracts a part of a string. The substr() method begins at a specified position, and returns a specified number of characters. The substr() method does not change the original string. To extract characters from the end of the string, use a negative start position.
The slice() method extracts a part of a string. The slice() method returns the extracted part in a new string. The slice() method does not change the original string. The start and end parameters specifies the part of the string to extract.
This is the what you should use to split:
string.slice(0, string.indexOf("'")); And then to handle your non existant value edge case:
function split(str) { var i = str.indexOf("'"); if(i > 0) return str.slice(0, i); else return ""; } Demo on JsFiddle
55
Nobody seems to have presented what seems to me as the safest and most obvious option that covers each of the cases the OP asked about so I thought I'd offer this:
function getCharsBefore(str, chr) { var index = str.indexOf(chr); if (index != -1) { return(str.substring(0, index)); } return(""); } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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