Extract data using REGEX

Question

May I know how to extract the following data using REGEX?

1) textA;textB;textC;textD

Extract "textA;textB;textC" aka parent of textD

2) textA;textB;textC;textD AB(numberA)

Extract "textA;textB;textC;textD" aka parent of AB(numberA)

3) textA;textB;textC;textD AB(numberA) Extract "numberA" for comparison

currently implementation, i use java string function, which make it un-configurable. I suspect the user didn't give me the actual data and I need to change the function again in the near future. I hope to use regex to make the function configurable.

popfalushi · Accepted Answer · 2012-06-06 13:08:18Z

3

(.*);[a-zA-Z]+ - $1
(.*) .* - $1

.* .*$(.*)$ - $1
How to use regexes and groups: http://www.javamex.com/tutorials/regular_expressions/capturing_groups.shtml
Example:

String s = "textA;textB;textC;textD";
Pattern pt = Pattern.compile("(.*);[a-zA-Z]+");
Matcher mt = pt.matcher(s);
if(mt.matches())
    System.out.println(mt.group(1));

That prints: textA;textB;textC.
UPD: Because the pattern is not known, answer like 1)textA;textB;textC;(textD) is also true. When asking such questions, it is better to write pattern, even if you don't know regexes you can use words only.
UPD: thx for correction

edited Jun 6, 2012 at 13:08

answered Jun 6, 2012 at 12:16

popfalushi

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3 Comments

seesee Over a year ago

care to explain a bit.. I tried using regexplanet.com/advanced/java/index.html for testing It doesn't work.

Sicco Over a year ago

I haven't tested this, but I think the 3rd regex is incorrect. I think it will match "AB(numberA)", while a match for "numberA" is requested. Shouldn't it be something like .* .*$(.*)$ - $1

cl-r Over a year ago

for N° 3 : ".*\$([A-Fa-f0-9 ,.]{1,128}).*\$*"extract the number (with basic format symbol) remove letters if no hexadecimals are waited and manage other symbols as you like to keep close to the correct transmitted String, you can also adapt size {128} to maximal length of number

navins · Accepted Answer · 2012-06-07 07:27:44Z

0

can simply use this?

String[] arr = "textA;textB;textC;textD AB".spilt("[; ]");

answered Jun 7, 2012 at 7:27

navins

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1 Comment

seesee Over a year ago

I can't customize it. You know Users?

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