Can you figure out why this JavaScript regex is having trouble parsing a number between 0 and 23?
pattern = /([0-1]?[0-9]|2[0-3])/
"12".match(pattern) // => matches 12
"23".match(pattern) // => matches 2 (should match 23)
Can you figure out why this JavaScript regex is having trouble parsing a number between 0 and 23?
pattern = /([0-1]?[0-9]|2[0-3])/
"12".match(pattern) // => matches 12
"23".match(pattern) // => matches 2 (should match 23)
The regular expression retrieves the initial occurrence found. The sequence [0-1]?[0-9] successfully matches 2.
To obtain the desired outcome, it is necessary to rearrange the pattern order:
var pattern = /2[0-3]|[0-1]?[0-9]/;
var pattern = /2[0-3]|[0-1]?[0-9]/;
document.write("12".match(pattern));
document.write('<br/>');
document.write("23".match(pattern));UPDATE
The mentioned code will match 234 and return 23. To avoid this match, you can utilize word boundary \b, or include ^, $ anchors as suggested by Gergo Erdosi:
var pattern = /\b2[0-3]\b|\b[0-1]?[0-9]\b/;
var pattern = /\b(2[0-3]|[0-1]?[0-9])\b/;
What could be the reason for the failure of this javascript regex in extracting numbers ranging from 0 to 23?
The reason behind the failure is that the first pattern in your regex always aims to match the input string before encountering the "|". Once a match is found, it will not proceed to the next pattern after the "|". In this case, your initial pattern matches "2", causing it to stop at that point.
To address this issue, consider reversing the order of the patterns or using start and end anchors to validate the input string more effectively.
> var pattern = /^([0-1]?[0-9]|2[0-3])$/g;
undefined
> "12".match(pattern)
[ '12' ]
> "23".match(pattern)
[ '23' ]
Ensure that the regular expression aligns with the entire string:
pattern = /^([0-1]?[0-9]|2[0-3])$/
Almost there! Consider trying the following approach:
pattern = /^([0-1]?[0-9]|2[0-3])$/
Currently, your regex is only capturing part of the input before moving on to evaluate the second half. To ensure a complete match, consider adjusting your expression accordingly.
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