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Full Discussion: ksh pattern matching
Top Forums Shell Programming and Scripting ksh pattern matching Post 302166001 by ripat on Sunday 10th of February 2008 12:00:17 PM
Old 02-10-2008
Quote:
Originally Posted by drl
The "Patterns and Regular Expression" syntax uses:
Code:
*(exp), ?(exp), !(exp) ...

(...) These patterns could be used within double brackets, for example (...) but not with string operator syntax (as far as I know) -- page 113 ff, 144 ff.
They do partially work in my ksh version (1993-12-28 r):

Code:
var='jo mike and dave are good friends'

$ echo ${var//a?(re)/_}
# returns > jo mike _nd d_ve _ good friends

$ echo ${var//g*(o)/_}
#returns > jo mike and dave are _d friends

$ echo ${var//+(o)/_}
#returns > j_ mike and dave are g_d friends

$ echo ${var//@(jo|dave)/_}
#returns > _ mike and _ are good friends

All returns as expected but I try to use the !(exp) like the PCRE look behind assertions (?<=exp). Still trying...
 

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LEARN ABOUT PHP

pow

POW(3)									 1								    POW(3)

pow - Exponential expression

SYNOPSIS

       number pow (number  $base, number  $exp)

DESCRIPTION

	Returns $base raised to the power of $exp.

       Note

	       In PHP 5.6 onwards, you may prefer to use the ** operator.

PARAMETERS

	      o $base
		- The base to use

	      o $exp
		- The exponent

RETURN VALUES

       $base  raised to the power of $exp. If both arguments are non-negative integers and the result can be represented as an integer, the result
       will be returned with integer type, otherwise it will be returned as a float.

EXAMPLES

       Example #1

	      Some examples of pow(3)

	      <?php

	      var_dump(pow(2, 8)); // int(256)
	      echo pow(-1, 20); // 1
	      echo pow(0, 0); // 1

	      echo pow(-1, 5.5); // PHP >4.0.6	NAN
	      echo pow(-1, 5.5); // PHP <=4.0.6 1.#IND
	      ?>

NOTES

       Note

	       This function will convert all input to a number, even non-scalar values, which could lead to weird results.

SEE ALSO

       exp(3), sqrt(3), bcpow(3), gmp_pow(3).

PHP Documentation Group 														    POW(3)
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