Lorem ipsum dolor sit amet consectetur adipisicing elit.
Is it possible to use .replace to change everything beyond amet in the sentence above?
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UserIsCorrupt
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see if this helps http://stackoverflow.com/questions/1431094/how-do-i-replace-a-character-at-a-particular-index-in-javascript – kosa Feb 15 '12 at 21:28
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Replace everything beyond `amet` *with what*? – David Thomas Feb 15 '12 at 21:28
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Instead of `.replace()`, eaiser to use `s.substr(0, s.indexOf('amet')) + "what you want to add on..."` – Michael Berkowski Feb 15 '12 at 21:29
1 Answers
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It is.
str.replace(/(amet).+$/, '$1FOO')
If "amet" actually contains weird characters, you have to 'regex quote' them: ., -, [ etc.
EDIT
Explaining regex is hard.
(amet)=> Capture a literal "amet". Capture, because you want to keep that part for the replacement, because you want to replace everything after "amet"..+=> Any type of characters (.), but at least one (+). If you want at least 0, you can use*instead of+.$=> the end of the subject (str). In thise case, it's unnecessary, because regex is greedy and won't stop until you tell it to (and since.+will never stop matching, the end is the end)$1=> This is a placeholder for 'the first match'. In this case, it's awlways"amet", because we matched a literal"amet". If the regex is variable, this$1will be unknown (which is what it exists for).FOO=> Another literal (the replacement). Your question includes "... change everything after ..." which - in my eyes - means "replace by"FOO"".
Clear enough? If not, I'd be happy to try to explain better. Always a great resource (for young and old, wise and not-so-wise and pro's and beginners): http://www.regular-expressions.info/
To conclude: regex is AWESOME.
Rudie
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1Could you explain your regex? From what I can tell it matches, and remembers the match of, `amet`, but what does the rest mean? Particularly the `'$1F00'`? – David Thomas Feb 15 '12 at 21:33
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This is exactly what I needed. Can I include `amet` in the replacement without specifying what comes before it? – UserIsCorrupt Feb 15 '12 at 21:48