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7Which of the following regular expression patterns matches a string that contains only lowercase letters, digits, and hyphens, and starts with a letter?Review Later/^[a-z][a-z0-9-]$//[a-z][0-9a-z-]//[a-z0-9-]//^[a-z]+[a-z0-9-]$/

Question

7Which of the following regular expression patterns matches a string that contains only lowercase letters, digits, and hyphens, and starts with a letter?Review Later/^[a-z][a-z0-9-]//[a−z][0−9a−z−]//[a−z0−9−]//[a−z]+[a−z0−9−]//[a-z][0-9a-z-]//[a-z0-9-]//^[a-z]+[a-z0-9-]/

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Solution

The regular expression that matches a string that contains only lowercase letters, digits, and hyphens, and starts with a letter is:

/^[a-z][a-z0-9-]*$/

Here's the step by step explanation:

  • ^: This asserts the start of a line.
  • [a-z]: This matches any lowercase letter.
  • [a-z0-9-]*: This matches any lowercase letter, digit, or hyphen. The * means "zero or more of the preceding element".
  • $: This asserts the end of a line.

So, this regular expression will match any string that starts with a lowercase letter and is followed by zero or more lowercase letters, digits, or hyphens.

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