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  1. !! +exec+ +var+ +string+
  2. tit:replace
  3. type:$type_both
  4. syntax:!replace [internal] `s1' by `s2' in `string'\
  5.  !replace `obj' `ident' by `s' in `string'
  6. mean:´®²Ù×÷. <p>\
  7.  ÔÚµÚÒ»¾äµÄÐÎʽÏÂ, ÏȶÔ.\
  8.  È»ºóËùÓгöÏÖ×Ó´® `s1' µÄµØ·½¶¼Ìæ»»³É `s2'. <br>\
  9.  Èç¹ûûÓйؼü´Ê `internal',\
  10.   Ôòµ÷Óà Linux ÃüÁî `sed' Íê³ÉÌæ»»,\
  11.  ËùÒÔÔÚ `s1' ºÍ `s2' Àï¿É½ÓÊÜÕýÔò±í´ïʽ.\
  12.  ÏêÇéÇë²Î¿´ `sed' µÄ˵Ã÷. <p>\
  13.   ÔÚµÚ¶þ¾äµÄÐÎʽÏÂ, `obj' ¿ÉÒÔÊÇ `char',\
  14.   `word', `item' »ò `line'.\
  15.  ¾­¹ý¶Ô `string' ×÷±äÁ¿Ìæ»»ºó,\
  16.   `string' ÄÚÓë `ident' ÏàͬµÄ´Ê¡¢Ïî»òÐб»Ìæ´úΪ\
  17.   `s'. <br>\
  18.  `ident' ¿ÉÒÔÊÇÒ»¸ö´®, ´ËʱËùÓÐÓë `ident' Æ¥ÅäµÄ¶ÔÏó\
  19.  (´Ê¡¢Ïî»òÐÐ)½«±»Ìæ»». `ident' Ò²¿ÉÒÔÊÇÒ»¸öÊý(Õý»ò¸ºÕûÊý `n'),\
  20.  Ç°Ãæ¹ÚÒÔ´Ê `number'. Õâʱ±»Ìæ»»µÄÊÇµÚ `n' ¸ö¶ÔÏó\
  21.  (µ± n&lt;0 ʱ, ±»Ìæ»»µÄÊǵ¹ÊýµÚ `n' ¸ö¶ÔÏó.)
  22.