Some Useful REX Expressions

• To locate phone numbers:

  1?\space?(?\digit\digit\digit?)?[\-\space]?\digit{3}-=\digit{4}

• To locate social security numbers:

  \digit{3}-=\digit{2}-=\digit{4}

• To locate text between parentheses:

  (=[^()]+)      <- without direction specification
       or
  >>(=!)+)       <- with direction specification

• To locate paragraphs delimited by an empty line and 4 spaces:

  >>\n\n=\space\P{4}!\n\n\space\space\space\space+\F\n\n=\space{4}

• To locate numbers in scientific notation; e.g., "-3.14 e -21":

  [+\-]?\space?>>[0-9]+\.?[0-9]*\space?e?\space?[+\-]?\space?[0-9]+