search/replace one liners without clobbering

[f77coder]

Hello,

I need a bit of help, usually for bulk replacement of a word in a bunch of files I do something like this

perl -pi -e 's/junk/replace/g' *.c

but i need to be able to put a conditional || on the search without clobbering, I'm updating old C files to C11 type generic. there are a lot of type specific qualifiers that i want to replace with generic

http://en.cppreference.com/w/c/numeric/tgmath

for example

generic   float  dbl       long      cfloat     c dbl      cmplx long
atanh    atanhf    atanh    atanhl    catanhf    catanh    catanhl

so in general i need to check for suffixes and prefixes at the same time otherwise the search term will clobber the previous search.

i need to put a conditional in the search like this

perl -pi -e 's/c$tgt || c$tgtf || c$tgtl || $tgtf || $tgtl /$tgt/g' *.
+c

where $tgt is the replacement string, for example

$tgt = tanh

i need to search and replace the following

tanhf  tanhl ctanhf ctanh ctanhl

but i get a complete mess out as the command still recurses and substitutes.

as well as the tricky one to replace 'rint' as it will conflict with printf

these old files have no spaces between operators but i'll space it out

exa=cexpl ( ccosl (arg), csinl ( arg) ) * cabsl (arg2) + csqrtl ( carg
+l(arg3) + csqrtl(cargl(arg4) * cargl(arg5) + cargl (arg5) * cargl(arg
+5));

result would be

exa = exp( cos(arg) , sin(arg) ) * fabs(arg2)+ sqrt(carg(arg3) + sqrt(
+carg(arg4)*carg(arg5)+carg(arg5)*carg(arg5));