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Frequently Used Regex Patterns(See Cheat Sheet for more)
# Python regex What it matches
(?:\(\d+\))?\d+(?:-\d+)*use this Phone numbers like (0123)123456, (0123)123-456-789, 123-456, and 123456.
[\w.-]+@[\w.-]+\.[a-zA-Z]{2,3}use this Email addresses
\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}use this IPv4 addresses
\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}use this Timestamps like 2006-08-14 02:34:56.
(\$\d{1,3}(?:,\d{3})*(?:\.\d+)?)use this Comma-separated currency like $234, $1,234, and $1,234.56.
\d{2,10}use this Numbers having 2 to 10 digits.

Find matching text using Python regex online

awk isn't handy if you want to extract different columns on different rows.

sed is line-oriented, but you want to extract text no matter whether they are in a line or not.

Regex syntax of awk/grep/sed varies slightly, which is a painful to make it right sometimes.

My use cases (see details in this blog post):

  1. Find all words beginning with a specific prefix.
  2. Extract fields out from structure text, like Protobuf Message definitions.
  3. Find specific attributes like hrefs of links in HTML/XML.

Additional resources: