javascript - regular expression

Question

Trying to form a regular expression to match the pattern of keywords, the pattern I found is like

remove all words before : till a space occurs and all words after : till ) occurs.

var newInput="keyword2:(content2) app keyword1:(content1) sos keyword:(content) das sad";

Im looking for an output like

app,sos,das,sad

Does it have to be regular expressions? You could just split by space and filter items that start with 'keyword'.. — Jeff
– Jeff, Commented Sep 7, 2012 at 5:53
it doesnt have to be the term keyword... it could be random words... — Sam
– Sam, Commented Sep 7, 2012 at 5:55

Tomalak · Accepted Answer · 2012-09-07 06:45:09Z

2

newInput.replace(/[^:\s]+:\([^)]*\)\s*/g, '');  // "app sos das sad"

Explanation

[^:\s]+:   # any character (except ' ' and ':') in front of ':'  "keyword1:'"
\([^)]*\)  # any character enclosed in '(' ')'                   "(content2)"
\s*        # trailing spaces                                     " "

This returns a space-separated string. You would have to trim it and split at spaces (or replace them) yourself.

edited Sep 7, 2012 at 6:45

answered Sep 7, 2012 at 5:51

Tomalak

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6 Comments

Sam Over a year ago

check the input "keyword2:(content2) app keyword1:(content1)";

Tomalak Over a year ago

@Sam Next time, do a better job at defining your inputs. With regular expression questions the answer can only be as good as the question is.

Tomalak Over a year ago

No. In your question a "searched word" always appears after a keyword:(contents) pattern.

Sam Over a year ago

"keyword2:(content2)" and "app" can come in any order

Tomalak Over a year ago

That's what I mean. Regex are extremely specific, so you must be extremely specific when stating your possible inputs. Otherwise you'll force people to guess, which is never a good thing. See modified answer. -- BTW, my answer was 99% of the way even with your more specific requirements. You could have made the last adjustment yourself, if you had tried.

|

nnnnnn · Accepted Answer · 2012-09-07 05:54:49Z

1

You can try:

var words = newInput.replace(/[^\s]+:\([^\)]+\)\s+/g, "").split(/\s+/);

Which will produce an array of the words as:

["app", "sos", "das", "sad"]

If you want a comma-separated string as shown in the question then:

var words = newInput.replace(/[^\s]+:\([^\)]+\)\s+/g, "").split(/\s+/).join(", ")

answered Sep 7, 2012 at 5:54

nnnnnn

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2 Comments

Sam Over a year ago

check the input "keyword2:(content2) app keyword1:(content1)";

nnnnnn Over a year ago

OK, sorry. I admit I found your description in the question a bit confusing, and you didn't show an example like that, but I guess you could change the regex pattern to /[^\s]+:\([^\)]+\)\s*/g (i.e., change the last + to a * to match optional whitespace), and then trim whitespace from the result.

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