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Global (g)
Case insensitive (i)
^$ match at line breaks (m)
Dot matches all (s; via XRegExp)
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Original Source | Taken Source

`.`	Any character except newline.
`\.`	A period (and so on for `\*`, `\(`, `\\`, etc.)
`^`	The start of the string.
`$`	The end of the string.
`\d`,`\w`,`\s`	A digit, word character `[A-Za-z0-9_]`, or whitespace.
`\D`,`\W`,`\S`	Anything except a digit, word character, or whitespace.
`[abc]`	Character a, b, or c.
`[a-z]`	a through z.
`[^abc]`	Any character except a, b, or c.
`aa\|bb`	Either aa or bb.
`?`	Zero or one of the preceding element.
`*`	Zero or more of the preceding element.
`+`	One or more of the preceding element.
`{n}`	Exactly n of the preceding element.
`{n,}`	n or more of the preceding element.
`{m,n}`	Between m and n of the preceding element.
`??`,`*?`,`+?`, `{n}?`, etc.	Same as above, but as few as possible.
`(`expr`)`	Capture expr for use with `\1`, etc.
`(?:`expr`)`	Non-capturing group.
`(?=`expr`)`	Followed by expr.
`(?!`expr`)`	Not followed by expr.

RegexPal 0.1.4 — a JavaScript regular expression tester

JavaScript Regex Quick Reference