Using regular expressions to add a string before each occurrence

Question

Using regular expressions to add a string before each occurrence

I have scoured numerous resources and forums but couldn't find a suitable solution for my problem. Since I am not well-versed in this topic, I am reaching out to the experts for assistance. This is the extent of what I have accomplished so far:

This is my current code:

var str = "Tell us about this interaction....";
var pat = /\([a-zA-Z]\)/g;
var out = str.replace(pat, "<br>");
alert(out);

The code snippet above only replaces the matched items with '< br >', please ignore the extra spaces as they are due to formatting issues.

The desired output I am aiming for::

"Tell us about this interaction... < br >(a) what the interaction was about..."

Any help or guidance on this matter would be greatly appreciated,

Thank you, Charles

javascript regex

Answer 1

Answer №1

Discover the mystical symbol $& that holds the answer you seek :)

var str = "Tell us about this interaction. Make sure you mention: (a) what the interaction was about (hangout, chit chat, discuss assignments, etc.) (b) what other things you and/or your friend was doing on the phone during this interaction (c) whether both of you were involved in this other activity and (d) any other information about this interaction you would like to share with us. Avoid using your friends full real name";
var pat = /\([a-zA-Z]\)/g;
var out = str.replace(pat, "<br>$&");
document.write(out);

Answer 2

Discover the mystical symbol $& that holds the answer you seek :)

var str = "Tell us about this interaction. Make sure you mention: (a) what the interaction was about (hangout, chit chat, discuss assignments, etc.) (b) what other things you and/or your friend was doing on the phone during this interaction (c) whether both of you were involved in this other activity and (d) any other information about this interaction you would like to share with us. Avoid using your friends full real name";
var pat = /\([a-zA-Z]\)/g;
var out = str.replace(pat, "<br>$&");
document.write(out);

Answer 3

Answer №2

The match has not been found in the performed action. For situations like this, a callback function or templates using $1 can be utilized for efficiency. More details on how to implement this can be found at this link

var str = "Tell us about this interaction. Make sure you mention: (a) what the interaction was about (hangout, chit chat, discuss assignments, etc.) (b) what other things you and/or your friend was doing on the phone during this interaction (c) whether both of you were involved in this other activity and (d) any other information about this interaction you would like to share with us. Avoid using your friends full real name";
var pat = /\([a-zA-Z]\)/g; // no match, use replace function.
var out = str.replace(pat, (t1) => `<br>${t1}`);
console.log(out);

var pat2 = /(\([a-zA-Z]\))/g; // match the group
var out2 = str.replace(pat2, '<br>$1');
console.log(out2)

Answer 4

The match has not been found in the performed action. For situations like this, a callback function or templates using $1 can be utilized for efficiency. More details on how to implement this can be found at this link

var str = "Tell us about this interaction. Make sure you mention: (a) what the interaction was about (hangout, chit chat, discuss assignments, etc.) (b) what other things you and/or your friend was doing on the phone during this interaction (c) whether both of you were involved in this other activity and (d) any other information about this interaction you would like to share with us. Avoid using your friends full real name";
var pat = /\([a-zA-Z]\)/g; // no match, use replace function.
var out = str.replace(pat, (t1) => `<br>${t1}`);
console.log(out);

var pat2 = /(\([a-zA-Z]\))/g; // match the group
var out2 = str.replace(pat2, '<br>$1');
console.log(out2)

Using regular expressions to add a string before each occurrence

Answer №1

Answer №2

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