025+ string(56) "\`^.[$()|*+?{' this contains some matches \`^.[$()|*+?{'"
025- string(74) "[this is a replacement] this contains some matches [this is a replacement]"
029+ string(30) "a this contains some matches a"
029- string(118) "[this is a replacement] this cont[this is a replacement]ins some m[this is a replacement]tches [this is a replacement]"