RegEx makes replaceing strings in JavaScript more effective, powerful, and fun. This is because split splits the string at the several points the regex matches. Note that the global flag - g - in split is irrelevant, unlike the i flag and other flags.
The string was split at 64a because that substring matches the regex specified. Regex already offers that with the g (global) flag, and the same can be used with replace. What if we wanted to perform replacements at multiple places? The string 3foobar4 matches the regex /\d.*\d/, so it is replaced. Here's an example: // matches a number, some characters and another number This syntax serves as a pattern where any parts of the string that match it will be replaced with the new substring. To use RegEx, the first argument of replace will be replaced with regex syntax, for example /regex/. replace means we can replace patterns and not just exact characters. RegEx can be effectively used to recreate patterns. replace method used with RegEx can achieve this. What if we're concerned with a pattern instead? Maybe, a number, two letters, and the word "foo" or three symbols used together? replace above is limited: the characters to be replaced are known - "ava". It is often used like so: const str = 'JavaScript' Īs you can see above, the replace method accepts two arguments: the string to be replaced, and what the string would be replaced with. replace method is used on strings in JavaScript to replace parts of string with characters. With RegEx, you can match strings at points that match specific characters (for example, JavaScript) or patterns (for example, NumberStringSymbol - 3a&). Regular Expressions (also called RegEx or RegExp) are a powerful way to analyze text.
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