I used other questions but so far only stumped.
This doesn't remove underscore.
Where is the mistake
var myString = str.toLowerCase().replace(/\W+/
myString= myString.replace('/\_/g','');
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1Your first line seems to have gotten cut off.Barmar– Barmar2017-02-04 16:38:24 +00:00Commented Feb 4, 2017 at 16:38
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It probably does not remove the underscore because the second line never executes, because the first line will result in a syntax error. Take a look at the console.user663031– user6630312017-02-04 17:12:10 +00:00Commented Feb 4, 2017 at 17:12
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1 Answer
In general, you can remove all underscores from a string using
const myString = '_123__abc___-Some-Text_';
console.log(myString.replace(/_/g, ''));
console.log(myString.replaceAll('_', ''));However, in this question, it makes sense to combine /_/g and /\W+/g regexps into one /[\W_]+/g. The \W pattern matches any char other than ASCII letters, digits and _, thus we need a custom character class to match both patterns.
Use
var myString = str.toLowerCase().replace(/[\W_]+/g,'');
where [\W_]+ matches one or more chars other than word chars and a _.
See the online regex demo.
2 Comments
Alexey Baguk
It matches other non letter symbols also
Wiktor Stribiżew
@AlexeyBaguk Whatever you mean by "non letter symbols" is unclear. The current OP problem is removing all occurrences of substrings that match
\W and _ patterns, hence for the current question, .replace(/[\W_]+/g, '') is the appropriate answer. If you need a regex for special chars, see Check for special characters in string. If you need anything else, please provide more concrete details (a test case, fiddle, codepen, etc.) and state what behavior you seek.