ax_check_awk_var_regexp

Check if AWK supports variable regexp. If successful execute ACTION-IF-SUCCESS otherwise ACTION-IF-FAILURE.

This work is heavily based upon testawk.sh script by Heiner Steven. You should find his script (and related works) at <http://www.shelldorado.com/articles/awkcompat.html>. Thanks to Alessandro Massignan for his suggestions and extensive nawk tests on FreeBSD.

AC_DEFUN([AX_CHECK_AWK_VAR_REGEXP], [
  AX_TRY_AWK_EXPOUT([variable regexp],
    [],[ r="x"; if ( "x" ~ r ) print "yes" ],[yes],
    [$1],[$2])
])

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