Start and End of Line
You can easily match strings that start or end with certain characters.
The ^ character matches the start of the string.
^hello matches hello there, hello sam, hellostop.
To match the end of the string, use the $ character
ere$ matches Where, and There.
Character Classes
[aeiou]
Matches Hey, and Hi, but not Zzz.
Atleast One character from the set
[^aeiou]
Matches Zzz, but not Hey or Hi.
No character from the set
^[aeiou]
String should start with an Vowel
[0-9] Numbers between 0 to 9
[0-9] [0-9] Any two digit Numbers
[a-zA-Z0-9_] or \w Matches character found in word
([^a-zA-Z0-9_]) or \W Anything other than a word character
\s For any whitespace character
\S For any non whitespace character
Some examples:
Zip code: ^[0-9]{5}
Ex: 97213, 01267
Zip Code ^[0-9]{5}-[0-9]{4} or ^\d{5}-\d{4}$
Ex:97213-4834
^d{1,3}$ matches 1,15,987
^d{1, }$ One or More digits
^[+-]{0,1} \d{0,}$ matches 123, +123, -123
(?i:[aeiou]) matches hello, and HELLO, but not Zzzz.
Date: ^\d{1,2}/|-\d{1,2}/|-d{4} matches 12/04/2004 or 12-04-2004
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| Author: precee 07 Jun 2004 | Member Level: Bronze Points : 0 |
This information very usefull for programming,Give more examples please.
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| Author: Rakesh Chander Sharma 15 Jun 2004 | Member Level: Silver Points : 0 |
Very Useful Information . Keep It up.
Rakesh
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| Author: Resmi R 18 Jun 2004 | Member Level: Bronze Points : 0 |
It was very good.Thanx a lot..I was in need of it.
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| Author: samuel charles finny 10 Aug 2004 | Member Level: Bronze Points : 0 |
if i want to check out whether a number is valid or not what expression v must give. for ex. we should not enter
+-9,.+9,/9., and a lot like this . we must calculate in all the ways possible by permutations and combinations. also it must allow expressions like +0.9,-9.0,....
so could anyone clarify me
thanks ...
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