Older browsers, including Internet Explorer and the original Edge, do not support it. In this mode, the dot matches line breaks. In this mode, the caret and dollar match before and after line breaks in the subject string. /i makes the regex match case insensitive.When using the replace() method, specify this modifier to replace all matches, rather than only the first one. JavaScript supports the following modifiers, a subset of those supported by Perl: In JavaScript source code, a regular expression is written in the form of /pattern/modifiers where “pattern” is the regular expression itself, and “modifiers” are a series of characters indicating various options. You only need to make sure your web pages have a doctype that requests the browser to use standards mode rather than quirks mode. But modern browsers do a very good job of following the JavaScript standard for regular expressions. In the past there were many serious browser-specific issues. This means your regular expressions should work exactly the same in all implementations of JavaScript. JavaScript’s regular expression flavor is part of the ECMA-262 standard for the language. Using Regular Expressions with JavaScript
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