I can't find any definitive information on what /
means in a JavaScript regex.
The code replace(/\r/g, '');
What I'm able to figure out is this:
/
= I don't know \r
= carriage return /g
= I don't know but It may mean 'the match must occur at the point where the previous match ended.'The forward slash character is used to denote the boundaries of the regular expression: ? The backslash character ( \ ) is the escaping character. It can be used to denote an escaped character, a string, literal, or one of the set of supported special characters.
Without any context such as a particular programming language's conventions, a forward slash in a regex has no special meaning; it simply matches a literal forward slash. In some languages, such as sed , Awk, Perl, and PHP, slashes are used around regular expressions in some contexts. /foo/n.
You can escape it by preceding it with a \ (making it \/ ), or you could use new RegExp('/') to avoid escaping the regex.
Short answer: Those are just comments. Let them go. Long answer: In most of the programming languages, anything written after a // on the same line of code is treated as single line comments. There is also something called as multi-line comments.
The slashes indicate the start and end of the regular expression.
The g
at the end is a flag and indicates it is a global search.
From the docs:
Regular expressions have four optional flags that allow for global and case insensitive searching. To indicate a global search, use the g flag. To indicate a case-insensitive search, use the i flag. To indicate a multi-line search, use the m flag. To perform a "sticky" search, that matches starting at the current position in the target string, use the y flag. These flags can be used separately or together in any order, and are included as part of the regular expression.
To include a flag with the regular expression, use this syntax:
var re = /pattern/flags;
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