regex - What does the following regular expression do? - 


foreach(@first) {     $first[$r] =~s/<.*>(.*)<.*>/$1/;      $first[$r]=$1;      $r++; }

what regular expression on line number 3?

the subtitution s/<.*>(.*)<.*>/$1/ looks idiotic attempt remove surrounding html tags string. example, given input

"<p>foo bar <em>baz</em> qux</p>"

we output " qux":

  • <.*> matches less-than sign, many characters possible, , greater-than sign.
  • (.*) matches many characters possible , remembers match $1.
  • <.*> matches less-than sign, many characters possible, , greater-than sign.

then, whole match replaced contents of capture group 1.

however, code looks written isn't experienced programmer, , doesn't know perl anyway. assuming $r = 0 before loop, equivalent to:

for (@first) {     /<.*>(.*)<.*>/;     $_ = $1; }

or

@first = map { /<.*>(.*)<.*>/; $1 } @first;

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