JavaScript 1.2 supports regular expressions , if you have
programmed in PERL you are in luck they both use the same
syntax . A regular expression is specified as a sequence
of characters within forward slashes / . They can also be
a JavaScript string passed to the RegExp( ). There are 2
optional modifiers that you can use and these are g ( for
global search ) and i ( which stands for case insensitive
search ) . These modifiers follow the second / or are passed
to the RegExp( ).
| Character |
what it means |
| \n , \r , \t |
matches newline , carriage return and
tab |
| \\ , \ / , \* , \+ , |? , etc etc etc |
matches a special character , ignores
its special meaning |
| [ . . . . . . ] |
matches anyone of the characters between
the brackets |
| [^ . . . . . ] |
matches any character not between the
brackets |
| . |
match any character other than a new line |
| \w , \W |
match any word / non word character |
| \s , \S |
match any whitespace / non whitespace |
| \d , \D |
match any digit / non digit |
| ^ , $ |
require match at beginning / end of string
or if in multiline ode beginning / end of a line |
| \b , \B |
require match at a word boundary / non
boundary |
| ? |
optional term , match 0 or 1 times |
| + |
match previous term one or more times |
| * |
match term zero or more times |
| {n} |
match previous term exactly n times |
| {n,} |
match previous term n or more times |
| {n,m} |
match at least n times but no more then
m times |
| a | b |
match either a or b |
| (sub) |
group sub expression sub into a single
term and remember text that it matched |
| n |
match exactly the same characters that
were matched by subexpression number n |
| $n |
in replacement strings , substitute the
text that matched the nth expression |
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