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ereg.php
  ereg - evaluate regular expression

  ereg(pattern_to_search,where_to_search)
  eregi(pattern_to_search,where_to_search) case insensitive
  ereg_replace(pattern_to_search,pattern_to_replace,where_to_search)
  eregi_replace ereg_replace case insensitive
  restituiscono 0 o 1

espressioni regolari:

  • "." qualunque carattere
  • "\@" Must include @
  • "^\@" Can't begin with @
  • "\@.*.\." Must have characters between @ and .
  • "\....*" At least two characters after the .
  • " " No spaces permitted
  • "<" ">" No angle brackets permitted

esempi:

  • (ereg(".", $first_name) == 1) - pu� collassare in ($first_name)