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String Manupulation.

Posted on 2004-10-21
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Medium Priority
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Last Modified: 2008-02-01
In a string whenever the charcters "DC#" appears, I want to extract the next 4 characters.
So for example, if the string was "LAWRENCE DC#1234 MORE TEXT" I want to extract "1234".
How can this be done ?
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Question by:apparition
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6 Comments
 
LVL 11

Expert Comment

by:cjjclifford
ID: 12371507
split the string on the '#' and take the first 4 characters of the second section of the split...

mystring.split( "#" ).substring( 0, 4 )
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LVL 5

Author Comment

by:apparition
ID: 12371526
I need to make sure the "#" is preceded by "DC"
so if my string was  "BLA # BLA DC#1234 BLA" your solution won't work.
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LVL 11

Expert Comment

by:cjjclifford
ID: 12371527
sorry, of course split() returns array, and also, substring() takes the second argument as the index to stop the substring, so 3 will be the fourth character...

so...

mystring.split( "#" )[1].substring( 0, 3 )
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LVL 11

Accepted Solution

by:
cjjclifford earned 500 total points
ID: 12371553
ok, so split on the "DC#", and check the result before doing the substring.

String[] bits = mystring.split( "DC#" );
if( bits.length == 2 ) {
    subs = bits[1].substring( 0, 3 );
}

you can also do this in a regular expression...
0
 
LVL 5

Author Comment

by:apparition
ID: 12371557
again won't work for a string like  "BLA # BLA DC#1234 BLA"
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LVL 11

Expert Comment

by:cjjclifford
ID: 12371776
thanks - out of interest, the regex impl is along the following lines:

import java.util.regex.*;
...
Matcher matcher = Pattern( ".*DC#(....).*" ).matcher( mystring );
if( matcher.matches() ) {
    substring = matcher.group(1);
}

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