Is there a reason why the replace() function in the code snippet below does not replace "my"?
$(function() {
var str = "put image in my gallery";
str = str.replace(/ my | in /g, " ");
});
You can find the code on jsfiddle here.
Appreciate any insights. Thank you.
Due to the advancement of the matcher, there can be no overlapping matches. This means that the space after "in" cannot be used to match the space before "my."
Let's break it down with "|" indicating the position of the matcher:
'put image| in my gallery' //found the first space
'put image| in |my gallery' //completed a match
'put image |my gallery' //replaced the match with a " "
'put image |my gallery' //fails to match the required space before "my"
Solutions include running two operations (using .replace() twice as shown in @alfasin's response) or utilizing the \b anchor to match at word boundaries instead of spaces (as demonstrated in @Grim's suggestion).
Here is an alternative solution using a single replace operation (assuming a trailing space after the matched words):
'put image in my gallery'.replace(/\b(?:my|in) /g, '');
//'put image gallery'
The use of \b, a zero-width assertion, ensures the matching occurs between word and non-word characters (\w and \W) to prevent overlaps and unnecessary spaces after replacements. Keep in mind, customized regular expressions may be needed for specific cases involving punctuation.
I recommend using the following code snippet:
str.replace(/\bmy\b|\bin\b/g, "");
The method provided also removes the spaces around the words, hence why the second one is not replaced.
I have edited to include a solution for replacing multiple words:
$(function() {
var toReplace = ['what','a','lot','of','words'];
var r = '';
toReplace.forEach(function(v) {
r += '\\b' + v + '\\b|';
});
r = r.substring(0, r.length - 1); // remove the final '|'
var re = new RegExp(r,"g");
var str = "here are some words";
str = str.replace(re, "");
console.log(str);
});
All you need to do is add the words to be replaced into the array. http://jsfiddle.net/kxjEE/7/
Revise your code snippet to:
$(function() {
var sentence = "add a picture to my collection";
sentence = sentence.replace(/ to( |\,|\.|\?)/g, " ").replace(/ my( |\,|\.|\?)/g, " ");
console.log(sentence);
});
When you substitute " in " with " ", the space before "my" becomes modified, indicating that it has been processed and the substitution carries on directly after that space.
Consider trying out the phrase "put image in my my gallery". The first instance of "my" will remain unchanged, while the second one will be swapped out.
Several individuals have already provided solutions for achieving the desired outcome, so this serves as an explanation for the reasoning behind it all.
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