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* Begin writing document for PCRE
Started writing learnxinyminutes document for PCRE to cover general purpose regular expressions.
Added introduction and a couple of details.
* Change introductory example for regex
The old example was incorrect. It's replaced with a simple one.
* Add some more introductory text
* Add first example
* Added more example and a table for proper formatting
* Add few more examples
* Formatting
* Improve example
* Edit description of character classes
* Add a way to test regex
Add https://regex101.com/ web application to test the regex provided in example.
* Add example of trap command
trap is a very important command to intercept a fatal signal, perform cleanup, and then exit gracefully. It needs an entry in this document.
Here a simple and most common example of using trap command i.e. cleanup upon receiving signal is added.
* Revert "Add example of trap command"
* Add an example of trap command
`trap` is a very important command to intercept a fatal signal, perform cleanup, and then exit gracefully. It needs an entry in this document.
Here a simple and most common example of using `trap` command i.e. cleanup upon receiving signal is added.
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