element72

I need help understanding stringregexp

5 posts in this topic

#1 ·  Posted (edited)

I looked at the examples and then I went back to look at what some of the characters in the script means, but I don't get it. Can someone translate it in laymen terms or "English" lol. From the first example you see this: 

(?i)<test>(.*?)</test>

What does (?i) and (.*?) mean or do? I'm scratching my head every time i read what the help file says.

Edited by element72

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(?i) 
"Caseless: matching becomes case-insensitive from that point on. By default, matching is case-sensitive. When UCP is enabled casing applies to the entire Unicode plane 0, else applies by default to ASCII letters A-Z and a-z only."

When you use (?i)  then you do not matters about charaters are small or big.

 

.

any character

*

repeat 0 or more times

?

try to catch the smallest possible string

 

(?i)<test>(.*?)</test>

catch the smallest possible string beetwen this two XML Tag.

 

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Thank you! That was very helpful. So what does smallest possible string mean? Can you give me an example on how the function will pick out the smallest possible string?

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Wait I think I might understand what it means now after thinking more about it. Say you have something like <test>a</test><test>b</test>.

Without catching the smallest possible string it can capture something like a</test><test>b. Am I understanding that right?

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#5 ·  Posted (edited)

Wait I think I might understand what it means now after thinking more about it. Say you have something like <test>a</test><test>b</test>.

Without catching the smallest possible string it can capture something like a</test><test>b. Am I understanding that right?

Correct.

#include <array.au3>

_Example()
Func _Example()
    Local $sTestString = '<test>aaaaa</test> <test>bbbbbb</test> <end></end>'
    
    Local $aResult1 = StringRegExp($sTestString,'(?i)<test>(.*?)</test>',3)
    _ArrayDisplay($aResult1)

    Local $aResult2 = StringRegExp($sTestString,'(?i)<test>(.*)</test>',3)
    _ArrayDisplay($aResult2)
EndFunc

 

Edited by mLipok

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Last update: 2017-02-26
Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind. 

My contribution (my own projects): * Debenu Quick PDF Library - UDF * Debenu PDF Viewer SDK - UDF * Acrobat Reader - ActiveX Viewer * UDF for PDFCreator v1.x.x * XZip - UDF * AppCompatFlags UDF * CrowdinAPI UDF * _WinMergeCompare2Files() * _JavaExceptionAdd() * _IsBeta() * Writing DPI Awareness App - workaround * _AutoIt_RequiredVersion() * Chilkatsoft.au3 UDF * TeamViewer.au3 UDF * JavaManagement UDF * VIES over SOAPPOP3.au3 UDF *  RTF Printer - UDF * XML.au3 - BETA * ADO.au3 UDF SMTP Mailer UDF * WinSCP UDF *

My contribution to others projects: * _sql.au3 UDF  *

Useful links: * Forum Rules * Forum etiquette *  Forum Information and FAQs * How to post code on the forum * AutoIt Online Documentation * AutoIt Online Beta Documentation * SciTE4AutoIt3 getting started * Convert text blocks to AutoIt code * Games made in Autoit * Programming related sites * Polish AutoIt Tutorial * DllCall Code Generator * 

Wiki: Expand your knowledge - AutoIt Wiki * Collection of User Defined Functions * How to use HelpFile * Best coding practices * 

IE Related:  * How to use IE.au3  UDF with  AutoIt v3.3.14.x * Why isn't Autoit able to click a Javascript Dialog? * Clicking javascript button with no ID * IE document >> save as MHT file * IETab Switcher (by LarsJ ) * HTML Entities *

I encourage you to read: * Global Vars * Best Coding Practices * Please explain code used in Help file for several File functions * OOP-like approach in AutoIt * UDF-Spec Questions *  EXAMPLE: How To Catch ConsoleWrite() output to a file or to CMD *

"Homo sum; humani nil a me alienum puto" - Publius Terentius Afer
"Program are meant to be read by humans and only incidentally for computers and execute" - Donald Knuth, "The Art of Computer Programming"
:naughty:  :ranting:, be  :) and       \\//_.

Anticipating Errors :  "Any program that accepts data from a user must include code to validate that data before sending it to the data store. You cannot rely on the data store, ...., or even your programming language to notify you of problems. You must check every byte entered by your users, making sure that data is the correct type for its field and that required fields are not empty."

 

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