How to write Regex Pattern ?

Question

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HI,

Can anyone tell me how to write regex string pattern?

What below code indicates-

Regex regex = new Regex("\\<[^\\>]*\\>");

Posted 18-Mar-14 1:45am

Prajakta V C

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4 solutions

Solution 2

while looking at the "Indicates" in your question and the reply to other solution posted. I though of sharing this very easy and precise article with you. It will explain you the Regex Fundamentals very easily.

Learn Regular Expressions (RegEx) with Ease

Further for the explanation of your posted Regex, You can have a look below

/\\<[^\\>]*\\>"/
\\ matches the character \ literally
< matches the character < literally
[^\\>]* match a single character not present in the list below
Quantifier: Between zero and unlimited times, as many times as possible, giving back as needed [greedy]
\\ matches the character \ literally
> a single character in the list > literally (case sensitive)
\\ matches the character \ literally
>" matches the characters >" literally

And for any explanation in future, Do visit the following link.

Regex Tester/Explainer

Hope it will help. :)

Posted 18-Mar-14 2:07am

VICK

Comments

Peter Leow 18-Mar-14 8:18am

Good effort, Vick. +5!

VICK 18-Mar-14 8:19am

Thanks Peter. :)

[no name] 19-Mar-14 2:22am

Thank you for explaining.

VICK 19-Mar-14 4:49am

You are welcome. :)

Solution 4

Download this eBook to learn Regular Expressions

http://it-ebooks.info/book/920/[^]

Good Luck

Posted 18-Mar-14 2:14am

Ajith K Gatty

Solution 1

for string pattern

"([a-zA-Z.'-]+),[ ]*([a-zA-Z.'-]+)"

Check this link

Refex to match string pattern mention

Posted 18-Mar-14 1:50am

vsrikanth87

Updated 18-Mar-14 19:52pm

v2

Comments

[no name] 18-Mar-14 7:56am

thanks for prompt reply. what * indicates? and is it compulsory to write [] - character class?

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Peter Leow · Accepted Answer · 2014-03-18T02:08:00

Solution 3

the original form should be :

\<[^\>]*\>

the extra \ is just to escape \ for the sake of c#.
It will match anything or nothing that is enclosed with '<' and '>'
The * means occurring zero or more times.

Posted 18-Mar-14 2:08am

Peter Leow

Comments

VICK 18-Mar-14 8:09am

To the point and precise. My 5+.

Peter Leow 18-Mar-14 8:27am

Thank you.

[no name] 19-Mar-14 2:23am

description is very easy to understand. thank you.

Peter Leow 19-Mar-14 2:33am

You are welcome.