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Currently, I'm using regex in Javascript / Node via find() and that works for finding the beginning of the pattern. But I'd also like to be able to find out where the pattern ends. Is that possible?
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str. match(pattern) , if pattern has the global flag g , will return all the matches as an array.
It indicates that the subpattern is a non-capture subpattern. That means whatever is matched in (?:\w+\s) , even though it's enclosed by () it won't appear in the list of matches, only (\w+) will.
A flag is an optional parameter to a regex that modifies its behavior of searching. A flag changes the default searching behavior of a regular expression. It makes a regex search in a different way. A flag is denoted using a single lowercase alphabetic character.
If you use the RegExp.exec() method, you can get the information you need.
var pattern = /\d+\.?\d*|\.\d+/;
var match = pattern.exec("the number is 7.5!");
var start = match.index;
var text = match[0];
var end = start + text.length;
/\d+\.?\d*|\.\d+/ is equivalent to new RegExp("\\d+\\.?|\\.\\d+"). The literal syntax saves some backslashes.
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