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JavaScript

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​x
 
/([A-Z])\w+/g

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( Capturing group #1. Groups multiple tokens together and creates a capture group for extracting a substring or using a backreference.

[ Character set. Match any character in the set.

A-Z Range. Matches a character in the range "A" to "Z" (char code 65 to 90). Case sensitive.

]

)

\w Word. Matches any word character (alphanumeric & underscore).

+ Quantifier. Match 1 or more of the preceding token.

Character classes
.	any character except newline
\w \d \s	word, digit, whitespace
\W \D \S	not word, digit, whitespace
[abc]	any of a, b, or c
[^abc]	not a, b, or c
[a-g]	character between a & g
Anchors
^abc$	start / end of the string
\b \B	word, not-word boundary
Escaped characters
\.\*\\	escaped special characters
\t \n \r	tab, linefeed, carriage return
Groups & Lookaround
(abc)	capture group
\1	backreference to group #1
(?:abc)	non-capturing group
(?=abc)	positive lookahead
(?!abc)	negative lookahead
Quantifiers & Alternation
a*a+a?	0 or more, 1 or more, 0 or 1
a{5}a{2,}	exactly five, two or more
a{1,3}	between one & three
a+?a{2,}?	match as few as possible
ab\|cd	match ab or cd

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