What does the regular expression ^\d+$ match?Any string that contains one or more digitsAny string that contains only digitsAny string that starts and ends with a digitAny string that starts with a digit
Question
What does the regular expression ^\d+$ match?Any string that contains one or more digitsAny string that contains only digitsAny string that starts and ends with a digitAny string that starts with a digit
Solution
The regular expression ^\d+$ matches any string that contains only digits.
Here's why:
- ^: This symbol matches the start of a line.
- \d: This is a shorthand character class that matches any digit (equivalent to [0-9]).
- +: This symbol matches one or more of the preceding element. In this case, it's saying we want one or more digits.
- $: This symbol matches the end of a line.
So, put together, ^\d+$ will match a line that starts with a digit, has only digits in the middle, and ends with a digit. In other words, it matches any string that contains only digits.
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