I need to find a match over the following text and I need to detect only one single under score by using REGEX:
Text: network_ip__c
Result: true
Text: Opportunity__c
Result: false
How can I accomplish this requirement in APEX?
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can you elaborate a bit more? Do you want to find underscore only? Or anything that is between underscores? – Novarg Feb 24 '17 at 13:34
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I need to find only one instance of underscore, for example, network_ip__c = true, Opportunity__c = false – Cuban coffee Feb 24 '17 at 14:08
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1There are a lot of sites that will help you with regex syntax, such as regex101.com – Folkert Feb 24 '17 at 14:20
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Try this
_[^_c]
This searches for _ that is not followed by _c
Try it here: https://regex101.com/
You can test it this way:
String test1 = 'Opportunity__c';
String test2 = 'Opportunity_abc__c';
String regex = '_[^_c]';
System.debug(test1.split(regex).size() != 1); // false
System.debug(test2.split(regex).size() != 1); // true
This may be a bit wierd, but if string does not contain regex, it will not be split (1 element as result) and if it contains, it will have at least 2 elements.
answered Feb 24 '17 at 14:28
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If you do not need regex you could simply do:
[string].replace('__','').contains('_');
If you are in Apex Not sure that regex would be required but that is up to you.
The regex (match all single non repeated occurrences of the character) would be: (?<!_)_(?!_) and will need to be adjusted for Apex.
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How can we calculate the CPU time even? Is there any specific metrics to use? – Arnold Jr. Jul 27 '17 at 3:24
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Throw the code in a loop (size of your choosing, maybe 1000) with debug statements of the CPU time before and after the loop and output the difference. Do several times and take average – Eric Jul 27 '17 at 3:26
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