Regex Recipes

Verified 2026-09-25 Each verified example was run in JavaScript, Python re, PCRE2-8 and Go regexp, unless its card names other engines.

• Extract Order IDs

  Extract order IDs of the form TX- plus five digits, keeping leading zeros.

  \bTX-\d{5}\b
  Open in workbench — Extract Order IDs

• Extract Log Levels

  Extract log level names such as INFO, WARN and ERROR from log lines.

  \blevel=(INFO|WARN|ERROR)\b
  Open in workbench — Extract Log Levels

• Extract Date-shaped Text

  Find text shaped like YYYY-MM-DD; this checks the shape only, not calendar validity.

  \b\d{4}-\d{2}-\d{2}\b
  Open in workbench — Extract Date-shaped Text

• Extract Text Between Brackets

  Extract the text between square brackets on one line, including empty brackets.

  \[([^\]\r\n]*)\]
  Open in workbench — Extract Text Between Brackets

• Extract Key-value Fields

  Extract key=value pairs whose key is an identifier and whose value has no spaces.

  \b([A-Za-z_][A-Za-z0-9_]*)=([^\s=]+)
  Open in workbench — Extract Key-value Fields

• Match Selected File Extensions

  Match file names that end in .csv or .json; other extensions are left out on purpose.

  \.(?:csv|json)$
  Open in workbench — Match Selected File Extensions

• Match Simple Slugs

  Match lowercase slugs made of letters, digits and single hyphens.

  ^[a-z0-9]+(?:-[a-z0-9]+)*$
  Open in workbench — Match Simple Slugs

• Match Version Triplets

  Find version numbers with exactly three numeric parts, such as 3.14.2.

  \b\d+\.\d+\.\d+\b
  Open in workbench — Match Version Triplets

• Find Repeated Words

  Find a word repeated immediately after itself; Go regexp is not offered because it has no backreferences.

  \b([A-Za-z]+)\s+\1\b
  JavaScript · This browserPython re · Local WASMPCRE2-8 · Local WASM
  Open in workbench — Find Repeated Words

• Extract Simple Double-quoted Strings

  Extract simple double-quoted strings on one line; escaped quotes are not handled.

  "([^"\\\r\n]*)"
  Open in workbench — Extract Simple Double-quoted Strings

• Find Horizontal Whitespace Runs

  Find runs of spaces and tabs without matching line breaks.

  [ \t]+
  Open in workbench — Find Horizontal Whitespace Runs

• Split Simple Comma-delimited Text

  Split a simple comma list and trim the spaces around commas; quoted CSV is not supported.

  \s*,\s*
  Open in workbench — Split Simple Comma-delimited Text

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