Salesforce Asked by Yossi Cadaner on January 6, 2022
B”H
I am unable to extract a consecutive set of numbers from within a (single line) string using ([0-9]+)
. However, surrounding it with match-all other does work (.*?[0-9].*)
. Can someone explain to me why ([0-9]+)
is not working for this task.
Here’s my code:
@Test
public void testMethod(){
Pattern pat = Pattern.compile("([0-9]+)");
Matcher matcher = pat.matcher("red fox 11133434 red fox");
Boolean matches = matcher.matches();
Assert.assertTrue("find numbers within string", matches);
Assert.assertEquals("11133434", matcher.group(1));
}
Here's a utility method with a corresponding test class
/**
* @param input string that contains any number
*
* @return first digits found in string, null if input blank, found no match or too large for integer
*/
public static Integer getInteger(String input){
if(String.isEmpty(input)){
return null;
}
Matcher matcher = Pattern.compile('\d+').matcher(input);
if(matcher.find()){
try {
return Integer.valueOf(matcher.group(0));
} catch(Exception e){
System.debug(LoggingLevel.ERROR, e);
return null;
}
} else {
return null;
}
}
Test
@IsTest
static void getInteger(){
System.assertEquals(
1234567890,
Strings.getInteger('foo 1234567890')
);
System.assertEquals(
200,
Strings.getInteger('-200')
);
System.assertEquals(
1234567890,
Strings.getInteger('1234567890 foo')
);
System.assertEquals(
1234567890,
Strings.getInteger('1234567890')
);
System.assertEquals(
1234567890,
Strings.getInteger('1234567890.321')
);
System.assertEquals(
1234567890,
Strings.getInteger(' 1234567890 ')
);
System.assertEquals(
1234567890,
Strings.getInteger('baz 1234567890 foo 321')
);
System.assertEquals(
null,
Strings.getInteger('baz 1234567890123456789012345678901234567890')
);
System.assertEquals(
null,
Strings.getInteger('give potato')
);
System.assertEquals(
null,
Strings.getInteger('')
);
System.assertEquals(
null,
Strings.getInteger(null)
);
}
Answered by dzh on January 6, 2022
B"H
Thanks Eric for answering the question. Just for completeness I am sharing the definition difference between find
and matches
from the Java docs:
A matcher is created from a pattern by invoking the pattern's matcher method. Once created, a matcher can be used to perform three different kinds of match operations:
- The
matches
method attempts to match the entire input sequence against the pattern.- The
lookingAt
method attempts to match the input sequence, starting at the beginning, against the pattern.- The
find
method scans the input sequence looking for the next subsequence that matches the pattern.
Answered by Yossi Cadaner on January 6, 2022
You are using a capturing group so this works as you expect: (You need to use find):
Pattern pat = Pattern.compile('([0-9]+)');
Matcher matcher = pat.matcher('red fox 11133434 red fox');
Boolean matches = matcher.find();
system.debug(logginglevel.error,matches);
system.debug(logginglevel.error,matcher.group(1));
You will notice the debugs are true and 11133434
A good site to test out your regex and break it down it:
Answered by Eric on January 6, 2022
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