A measurement of the exclusive and semi-exclusive production of charged pion pairs in proton-proton collisions,
$pp\rightarrow p(p^{*})+ \pi^{+}\pi^{-}+ p (p^{*})$, where the $ \pi^+\pi^-$ pair is emitted at central rapidities,
and the scattered protons stay intact (p) or diffractively dissociate ($p^*$) without detection is presented in these proceedings.
The measurement is performed with the CMS detector at the LHC, using a data sample corresponding to an
integrated luminosity of 450$\mu b^{-1}$ collected at a center-of-mass energy of 7 TeV.
The dipion cross section, measured for single-pion transverse momentum $p_T >0.2$ GeV and rapidity $|y|<2$, is
$26.5\pm0.3(stat.)\pm5.0(syst.)\pm1.1\mu b$. The differential cross sections measured as a function of the invariant mass and $p_T$ of the pion pair are compared to phenomenological predictions.