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Options

You can specify options that control how a Regex is processed.

  • Case-insensitive (i): RE pattern matching is case-sensitive, unless you use the case-insensitive option.

Drill

  • Set the i for insensitive option and search for the string re. Turn the option off and on a few times to see the difference.
  • Turn the i option off.
  • Global (g): By default, once a match is found the regex stops processing; the global option continues processing the RE over the rest of the input text.

Drill

  • Turn the g for global option off and on a few times to see the difference.
  • Leave the g option on.
  • Multiline (m): By default, ^ matches the very beginning of the input text, and $ the very end; if the input text is actually multiple lines (text with embedded newlines), the multiline option causes ^ to match the beginning and $ to match the end of each embedded line.

Drill

  • Search for the string Re.
  • Now change the search to ^Re - the ^ means only match the pattern if it begins at the beginning of the data - you should see only one match.

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