Unable to replace using RegExp

Question

I am trying to replace a particular set of strings using RegExp but it is not replacing. The regex I am trying is

\@223(?:\D|'')\gm

The set of strings to test on are these

@223 ->Replace 223 with #
@223+@33 ->Replace 223 with #
@22;    ->Not Replace
@2234   ->Not Replace 
@22234  ->Not Replace
@223@44  ->Replace 223 with #

do you went to change it to 223 with # if it start with @223 ? — aziz k'h
– aziz k'h, Commented Oct 30, 2020 at 5:43

aziz k'h · Accepted Answer · 2020-10-30 06:01:09Z

2

if this what you went :

var string = `
@223
@223+@33
@22;
@2234
@22234
@223@44
`;
regex = /(?<=@)(223)(?=\D)/g;
string = string.replace(regex, "#");
console.log(string);

output :

@#
@#+@33
@22;
@2234
@22234
@#@44

explanation :

(?<=@) : test if leaded by @ character.
(?=\D) : followed by any character except digit

edited Oct 30, 2020 at 6:01

answered Oct 30, 2020 at 5:53

aziz k'h

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Comments

Erik Lumme · Accepted Answer · 2020-10-30 05:47:33Z

1

There are two issues with your regex:

You're using the wrong slashes, should be /@223(?:\D|'')/gm.
The non-capturing group will still be included in the complete match, so you might need to add parenthesis around just the @223 part and just replace that group.

You can test your regex in a service like regex101.com. Note that in that service, the start and end slashes are already implicitly included.

answered Oct 30, 2020 at 5:47

Erik Lumme

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