Replace all matched strings with modified substring

Question

Actually, I want to replace all matched string used as a key of given object to find the value using javascript regular expression. For example: we have string as

hello,how are you???!!OH!! i am fine. what about you, !!FRIEND!!? I am !!GOOD!!.

and object is like var mapper={"OH":"oh+","FRIEND":"friend+","GOOD":"good+"}

Then output should be like:

hello,how are you???OH+ i am fine. what about you, FRIEND+? I am GOOD+.

As starting and ending !! sign will be replaced with only + sign in the end.

var mapper={"OH":"oh+","FRIEND":"friend+","GOOD":"good+"};
data=data.replace(new RegExp("!![A-Z]*!!", 'g'),modifiedSubstring);

I am new to use regular expression but tried some code as placed above. In this expression what should I write instead of modifiedSubstring.

no, it will match uppercase words starts and end with !!. then replace all of them with + appending in last — gurvk
– gurvk, Commented Mar 10, 2016 at 20:17

guest271314 · Accepted Answer · 2016-03-10 20:21:57Z

4

Try using RegExp /(\!+(?=[A-Z]+))|(\!+(?=\s|\?|\.|$))/g to match multiple ! characters followed by capital letters , or multiple ! characters followed by space character, . character or end of input. Replace first capture group with "" empty string, replace second capture group with + character

var data = "hello,how are you???!!OH!! i am fine. what about you, "
           + "!!FRIEND!!? I am !!GOOD!!.";

data = data.replace(/(\!+(?=[A-Z]+))|(\!+(?=\s|\?|\.|$))/g
             , function(match, p1, p2) {
                 return p1 ? "" : "+" 
           });

document.body.innerHTML = data;

answered Mar 10, 2016 at 20:21

guest271314

1

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4 Comments

gurvk Over a year ago

what if i want to match the uppercase word with a given object key and return the value. e.g var mapper={"OH":"oh+","FRIEND":"friend+"};

guest271314 Over a year ago

@gurvk Yes, that should be possible. Though RegExp at solution above matches !! characters, not uppercase letters . Original Question did not include mapping matches to object ?

gurvk Over a year ago

hey, but it adds a line break after replacing that content. can you help me out from this problem?

guest271314 Over a year ago

@gurvk A line break should not be added to replacement string. Can you create a jsfiddle jsfiddle.net to demonstrate ?

Alden Be · Accepted Answer · 2016-03-10 20:30:01Z

4

You can capture the data inside the desired pattern and return it with your desired formatting by using parentheses and $1

    data = "hello,how are you???!!OH!! i am fine. what about you, !!FRIEND!!? I am !!GOOD!!.";

    data=data.replace(new RegExp("!!([A-Z]*)!!", 'g'),"$1+");

answered Mar 10, 2016 at 20:30

Alden Be

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2 Comments

gurvk Over a year ago

it is working in old case without using object mapper. how it will work with mapper object. i tried using mapper["$1"] instead of ["$1"]

gurvk Over a year ago

object related problem solved with the help of replacement using function.

score 2 · Accepted Answer · 2016-03-10 20:34:04Z

2

You can look for instances like !!word!! and replace it to word+ using this regex.

Regex: !!([A-Z]*?)!!

Explanation:

It will match !! followed by a WORD followed by !!.

Replacement to do:

\1+ This will replace the match with just WORD+ as WORD falls in first captured group.

`Regx101 Demo`

edited Mar 10, 2016 at 20:34

answered Mar 10, 2016 at 20:20

user2705585

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