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Regular Expression
r"
^((?:c1|c2|c3|c4|c5|c6|c7|c8)(?:c1|c2|c3|c4|c5|c6|c7|c8|c9|c10|c11)(?:c1|c2|c3|c4|c5|c6|c7|c8|c9|c10))_aa_
"
gm
Input 1
1
New
c1c2c4_aa_1 c1c2c3_aa_2 c1c2c8_aa_3 c1c3c4_aa_4 c1c2c4_bb_41 c1c8c9_cc_58 c1c3c11_aa_19
Substitution
\g<1>_zz_
c1c2c4_aa_1 c1c2c3_aa_2 c1c2c8_aa_3 c1c3c4_aa_4 c1c2c4_bb_41 c1c8c9_cc_58 c1c3c11_aa_19