regular-expressions.js

var a = str.search(/CheatSheet/i);

// Modifiers

i       perform case-insensitive matching
g       perform a global match
m       perform multiline matching

// Patterns

\       Escape character
\d      find a digit
\s      find a whitespace character
\b      find match at beginning or end of a word
n+      contains at least one n
n*      contains zero or more occurrences of n
n?      contains zero or one occurrences of n
^       Start of string
$       End of string
\uxxxx  find the Unicode character
.       Any single character