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/
...
  ){1,4}          # 1 to 4 lines. (0 will permit an empty match.)
)                 # Done capturing.
/mx;              # /m so that ^ anchor works, /x for comments.

/
...
  ){1,4}        # 1 to 4 lines. (0 will permit an empty match.)
)               # Done capturing.
/mx;            # /m so that ^ anchor works, /x for comments.