Alphanumeric character Itself

/0 The NUL character (/u0000)

/t Tab (/u0009)

/n Newline (/u000A)

/v Vertical tab (/u000B)

/f Form feed (/u000C)

/r Carriage return (/u000D)

/xnn The Latin character sPEcified by the hexadecimal number nn; for example, /x0A is the same as /n

/uxxxx The Unicode character specified by the hexadecimal number xxxx; for example, /u0009 is the same as /t

/cX The control character ^X; for example, /cJ is equivalent to the newline character /n

 

[...] Any one character between the brackets.

[^...] Any one character not between the brackets.

.  Any character except newline or another Unicode line terminator.

/w Any ASCII word character. Equivalent to [a-zA-Z0-9_].

/W Any character that is not an ASCII word character. Equivalent to [^a-zA-Z0-9_].

/s Any Unicode whitespace character.

/S Any character that is not Unicode whitespace. Note that /w and /S are not the same thing.

/d Any ASCII digit. Equivalent to [0-9].

/D Any character other than an ASCII digit. Equivalent to [^0-9].

[/b] A literal backspace (special case).

 

{n,m} Match the previous item at least n times but no more than m times.

{n,} Match the previous item n or more times.

{n} Match exactly n occurrences of the previous item.

?  ;match zero or one occurrences of the previous item. That is, the previous item is optional. Equivalent to {0,1}.

+ Match one or more occurrences of the previous item. Equivalent to {1,}.

* Match zero or more occurrences of the previous item. Equivalent to {0,}.

 

| Alternation. Match either the subexpression to the left or the subexpression to the right.

(...) Grouping. Group items into a single unit that can be used with *, +, ?, |, and so on. Also remember the characters that match this group for use with later references.

(?:...) Grouping only. Group items into a single unit, but do not remember the characters that match this group.

/n Match the same characters that were matched when group number n was First matched. Groups are subexpressions within (possibly nested) parentheses. Group numbers are assigned by counting left parentheses From left to right. Groups formed with (?: are not numbered.

 

^ Match the beginning of the string and, in multiline seArches, the beginning of a line.

$ Match the end of the string and, in multiline searches, the end of a line.

/b Match a word boundary. That is, match the position between a /w character and a /W character or between a /w character and the beginning or end of a string. (Note, however, that [/b] matches backspace.)

/B Match a position that is not a word boundary.

(?=p) A positive lookahead assertion. Require that the following characters match the pattern p, but do not include those characters in the match.

(?!p) A negative lookahead assertion. Require that the following characters do not match the pattern p.

 

i Perform case-insensitive matching.

g Perform a global matchthat is, find all matches rather than stopping after the first match.

m Multiline mode. ^ matches beginning of line or beginning of string, and $ matches end of line or end of string.

 

string.replace(regexp, replacement)

Characters Replacement

$1, $2, ..., $99  The text that matched the 1st through 99th parenthesized subexpression within regexp

$&  The substring that matched regexp

$'  The text to the left of the matched substring

$'  The text to the right of the matched substring

$$  A literal dollar sign

 

name.replace(/(/w+)/s*,/s*(/w+)/, "$2 $1");

text.replace(/"([^"]*)"/g, "''$1''");

text.replace(//b/w+/b/g, function(word) {

                           return word.substring(0,1).toUpperCase( ) +

                                  word.substring(1);

                         });