where i can learn regular expressions to use them and to create my own regex

[dilstn]

I really need of some knowledge about regular expression ,, as how to create own regex or rex ... so suggest me some tips to learn from the scratch for regular expression

[Ayn]

There are some pretty good resources online.

• http://www.regular-expressions.info has a good tutorial and serves as a good reference.
• RegExr - http://www.gskinner.com/RegExr - is an excellent tool for building regular expressions that even shows you what each part of the regular expression does.
• I also like http://regexpal.com which can be used for the same thing, it's a bit more basic.

Also you might want to grab a book. "Mastering Regular Expressions" is nice for instance: http://www.amazon.com/Mastering-Regular-Expressions-Jeffrey-Friedl/dp/0596528124/

[Rocket66]

RegExr is an awesome tool! I like it!

[dart · Accepted solution]

The Field Extractor app on Splunkbase contains a regular expression reference which you can check if you hit the edit link on any of the extractions, which will give you examples and you could start by modifying them.

For more of a step by step tutorial, Zed Shaw's Learn Regex the Hard way is a great course to follow.

A reasonable reference exists in the Regular Expressions Info site, which has a quick start, tutorial and pages covering 'advanced' topics such as lookbehind.