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Full Discussion: Regex to match IP address
Top Forums UNIX for Advanced & Expert Users Regex to match IP address Post 302401447 by jim mcnamara on Saturday 6th of March 2010 07:03:33 AM
Old 03-06-2010
It is important to note -
the perl regex engine is not identical to the engine used for grep.

There are a lot of flavors of regex out there.

You may want to check out on google or find a copy of J Freidl's 'Mastering Regular Expressions':

nondeterministic finite-state automata NFA
deterministic finite-state automata DFA
 

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finite(3M)																finite(3M)

NAME
finite(), finitef(), finitel(), finitew(), finiteq() - finiteness functions SYNOPSIS
DESCRIPTION
The function determines whether its argument has a finite value (zero, subnormal, or normal, and not infinite or NaN). These functions are superseded by the standard macro. They are provided in HP-UX to facilitate importing code from other platform. is a version of it takes a argument. is a version of it takes a argument. is an version of it takes an argument. is equivalent to on HP-UX systems. USAGE
To use these functions, compile either with the default option or with the and options. To use or compile also with the option. Make sure your program includes Link in the math library by specifying on the compiler or linker command line. For more information, see the at the following site: RETURN VALUE
returns a nonzero value if and only if its argument has a finite value. ERRORS
No errors are defined. SEE ALSO
fpclassify(3M) isfinite(3M), isinf(3M), isnan(3M), isnormal(3M), signbit(3M), math(5). STANDARDS CONFORMANCE
These functions are not specified by any current standard. HP Integrity Server Only finite(3M)
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