Explain about regular expression of RegExp

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I'm using

/^([\w-\.]+@([\w-]+\.)+[\w-]{2,4})?$/ this expression for my email validation it's working but now i want know what is meaning of every character in this expression step by step.

like [\w-\.] meaning,
([\w-]+\.) meaning,
([\w-\.]+@([\w-]+\.) meaning,
[\w-]{2,4}.

thank you in advanced.

Posted 9-Sep-15 19:18pm

RamAchanta

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Suvabrata Roy 10-Sep-15 1:33am

just google javascript Regex

RamAchanta 10-Sep-15 1:38am

i need step by step explanation about that expression.

4 solutions

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*Suvabrata Roy* · Answer 1 · 2015-09-09T19:56:00

Solution 1

Hi,

Regex:
http://www.zytrax.com/tech/web/regex.htm[^]

Symbols:
https://qualysguard.qualys.com/qwebhelp/fo_help/module_pc/policies/regular_expression_symbols.htm[^]

Posted 9-Sep-15 19:56pm

Suvabrata Roy

*Suvabrata Roy* · Answer 2 · 2015-09-09T19:56:00

Solution 2

Here you go for step by step info : http://www.w3schools.com/jsref/jsref_obj_regexp.asp[^]

Posted 9-Sep-15 19:56pm

Suvabrata Roy

Comments

RamAchanta 10-Sep-15 2:18am

Thank you....

Patrice T · Answer 3 · 2015-09-09T20:40:00

Solution 3

Some documentation: perl regex
http://perldoc.perl.org/perlre.html[^]
and to see your reg expression
https://www.debuggex.com/[^]
Details change depending on which regex package you use.

Posted 9-Sep-15 20:40pm

Patrice T

Updated 9-Sep-15 20:43pm

v2

Comments

RamAchanta 10-Sep-15 2:52am

Thank you.

Peter Leow · Answer 4 · 2015-09-09T21:13:00

Solution 4

Look no further than codeproject The 30 Minute Regex Tutorial[^]

Posted 9-Sep-15 21:13pm

Peter Leow

Comments

RamAchanta 10-Sep-15 3:16am

Thank you.