Confusion Regular expression problems rules

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Due to so much less examples of regular expression on internet.. i have lots of confusion in regular expression.

[ab] what is the meaning of it in regular expression

it it a,b or its like a,b,aa,bb,aaa,bbb............
and

[0-9] is it like 0,1,2,3,4,5,6,7,8,9 only ?? or 0,1,2,3,4,5,6,7,8,9 ,10,11,12....

and what is the meaning of ^ and $ in regular expression??

Posted 4-Jul-12 6:44am

codegeekalpha

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Sergey Alexandrovich Kryukov 4-Jul-12 15:52pm

Due to what?! To so much less examples? You must be joking... :-)
--SA

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Raje_ · Accepted Answer · 2012-07-04T06:52:00

Solution 1

your confusion are for sure. let me try to remove your confusion.

[..] :- it means it has explicit set of character to match.
^ :- it means start of string.
$ :- it means end of string.
there are more like--
\ :- preceding one of the above or down.
. :- any character except new line(\n).
| :- alternation.

Posted 4-Jul-12 6:52am

Raje_

Updated 4-Jul-12 6:53am

v2

Comments

codegeekalpha 4-Jul-12 14:29pm

can u give me some examples??

Sandeep Mewara 4-Jul-12 14:57pm

Find as many you want here: http://www.google.co.in/search?q=regular+expression+examples&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

Sergey Alexandrovich Kryukov 4-Jul-12 15:53pm

My 5.
--SA