let str = "AllThe-small Things" str = str.replace(/([a-z])([A-Z])/g, "$1 $2"); console.log(str); **// output is:All The-small Things** *What difference between those two code blocks? Normally, I know I have 3 capture groups on that sample. The one is for lower case the other is for uppercase and t…

No, so the regex finds any* pairs of a lowercase letter ([a-z]) directly followed by an uppercase letter ([A-Z]). The pattern is /[a-z][A-Z]/, that’s two characters. So in the string “AllThe-small Things”, there is one instance of that, “lT”: AllThe-small Things ↑ here The pattern to find eac…

there is only two capture groups, what’s the third one you are referring to?

[image] Can Anyone Explain. What is the "$1 $2" in first replace statement of solution 1? JavaScript str = str.replace(/([a-z])([A-Z])/g, "$1 $2") ↑ ↑ $1 $2 So if str is “aB”, that matches (lowercase a-z character follow…

that’s not a capture group, that is the new text that is being inserted in the string in place of what the regex matched $1 and $2 let you use what was captured by the capture groups in the new string, $1 is a placeholder for what the first capture group has captured, and $2 for the second one in …

You mean ,first capturing groups should be lower case and second group should be upper case for first case code.(str.replace(/([a-z])([A-Z])/g, “$1 $2”). if str is “AllThe-small Things” for first case I should to find lower cases ? Because for “All” the ‘A’ is uppercase but still it can come first…

Thanks for the quick answer. I understood now. I was confused about that white space :slight_smile: between those groups($1 $2) has also space I have missed that white space.

Thank you , I really appreciate it for your great explanation … I totaly understood :slight_smile:

Regex:Capturing Groups

JavaScript

DanCouper March 4, 2021, 8:41am 3

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Regex:Capturing Groups

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