{"id":565,"date":"2024-04-15T08:47:57","date_gmt":"2024-04-14T23:47:57","guid":{"rendered":"http:\/\/inwelly.com\/?p=565"},"modified":"2024-04-23T05:27:55","modified_gmt":"2024-04-22T20:27:55","slug":"php-%ec%a0%95%ea%b7%9c%ec%8b%9d","status":"publish","type":"post","link":"https:\/\/inwelly.com\/?p=565","title":{"rendered":"PHP \uc815\uaddc\uc2dd"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>\ud30c\uc77c\uc774\ub098 \ubb38\uc790\uc5f4 \ub0b4\uc5d0 \ud3ec\ud568\ub418\uc5b4 \uc788\ub294 \ud2b9\ubcc4\ud55c \ud328\ud134(\ub610\ub294 \ud2b9\ubcc4\ud55c \uc870\uac74\uc744 \ub9cc\uc871\ud558\ub294 \ubb38\uc790\uc5f4)\uc744 \uac80\uc0c9\ud558\uae30 \uc704\ud574 \ubbf8\ub9ac \uc815\uc758\ub41c \ub2e4\uc591\ud55c \ud2b9\uc218 \ubb38\uc790\ub4e4\uc758 \uc870\ud569\uc744 \uc815\uaddc\uc2dd(regular expression)\uc774\ub77c \ud55c\ub2e4. \uc815\uaddc\uc2dd\uc5d0\uc11c\uc758 \ud2b9\uc218 \ubb38\uc790(special character)\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.\n\n\n(1) ^ (caret) : \ub77c\uc778\uc758 \ucc98\uc74c\uc774\ub098 \ubb38\uc790\uc5f4\uc758 \ucc98\uc74c\uc744 \ud45c\uc2dc\n\n\uc608 : ^aaa (\ubb38\uc790\uc5f4\uc758 \ucc98\uc74c\uc5d0 aaa\ub97c \ud3ec\ud568\ud558\uba74 \ucc38, \uadf8\ub807\uc9c0 \uc54a\uc73c\uba74 \uac70\uc9d3)\n\n(2) $ (dollar) : \ub77c\uc778\uc758 \ub05d\uc774\ub098 \ubb38\uc790\uc5f4\uc758 \ub05d\uc744 \ud45c\uc2dc\n\n\uc608 : aaa$ (\ubb38\uc790\uc5f4\uc758 \ub05d\uc5d0 aaa\ub97c \ud3ec\ud568\ud558\uba74 \ucc38, \uadf8\ub807\uc9c0 \uc54a\uc73c\uba74 \uac70\uc9d3)\n\n(3) . (period) : \uc784\uc758\uc758 \ud55c \ubb38\uc790\ub97c \ud45c\uc2dc\n\n\uc608 : ^a.c (\ubb38\uc790\uc5f4\uc758 \ucc98\uc74c\uc5d0 abc, adc, aZc \ub4f1\uc740 \ucc38, aa \ub294 \uac70\uc9d3)\n\na..b$ (\ubb38\uc790\uc5f4\uc758 \ub05d\uc5d0 aaab, abbb, azzb \ub4f1\uc744 \ud3ec\ud568\ud558\uba74 \ucc38)\n\n(4) &#91;] (bracket) : \ubb38\uc790\uc758 \uc9d1\ud569\uc774\ub098 \ubc94\uc704\ub97c \ub098\ud0c0\ub0c4, \ub450 \ubb38\uc790 \uc0ac\uc774\uc758 \"-\"\ub294 \ubc94\uc704\ub97c \ub098\ud0c0\ub0c4\n\n&#91;]\ub0b4\uc5d0\uc11c \"^\"\uc774 \uc120\ud589\ub418\uba74 not\uc744 \ub098\ud0c0\ub0c4\n\n\uc774\uc678\uc5d0\ub3c4 \"\ubb38\uc790\ud074\ub798\uc2a4\"\ub97c \ud3ec\ud568\ud558\ub294 &#91;:\ubb38\uc790\ud074\ub798\uc2a4:]\uc758 \ud615\ud0dc\uac00 \uc788\ub2e4.\n\n\uc5ec\uae30\uc5d0\uc11c \"\ubb38\uc790\ud074\ub798\uc2a4\"\uc5d0\ub294 alpha, blank, cntrl, digit, graph, lower,\n\nprint, space, uppper, xdigit\uac00 \uc788\ub2e4.\n\n\uc774\uc5d0 \ub300\ud55c \uc790\uc138\ud55c \ub0b4\uc6a9\uc740 C\uc5b8\uc5b4\uc758 &lt;ctype.h>\ub97c \ucc38\uc870\ud558\uba74 \ub41c\ub2e4.\n\n\uc608\ub97c \ub4e4\uc5b4 &#91;:digit:]\ub294 &#91;0-9]\uc640 &#91;:alpha:]\ub294 &#91;A-Za-z]\uc640 \ub3d9\uc77c\ud558\ub2e4.\n\n\uc774\uc678\uc5d0 &#91;:&lt;:]\uc640 &#91;:>:]\ub294 \uc5b4\ub5a4 \ub2e8\uc5b4(\uc22b\uc790, \uc54c\ud30c\ubcb3, '_'\ub85c \uad6c\uc131\ub428)\uc758 \uc2dc\uc791\uacfc \ub05d\n\n\uc744 \ub098\ud0c0\ub0b8\ub2e4.\n\n\uc608 : &#91;abc] (a, b, c \uc911 \uc5b4\ub5a4 \ubb38\uc790, \"&#91;a-c].\"\uacfc \ub3d9\uc77c)\n\n&#91;Yy] (Y \ub610\ub294 y)\n\n&#91;A-Za-z0-9] (\ubaa8\ub4e0 \uc54c\ud30c\ubcb3\uacfc \uc22b\uc790)\n\n&#91;-A-Z]. (\"-\"(hyphen)\uacfc \ubaa8\ub4e0 \ub300\ubb38\uc790)\n\n&#91;^a-z] (\uc18c\ubb38\uc790 \uc774\uc678\uc758 \ubb38\uc790)\n\n&#91;^0-9] (\uc22b\uc790 \uc774\uc678\uc758 \ubb38\uc790)\n\n&#91;&#91;:digit:]] (&#91;0-9]\uc640 \ub3d9\uc77c)\n\n(5) {} (brace) : {} \ub0b4\uc758 \uc22b\uc790\ub294 \uc9c1\uc804\uc758 \uc120\ud589\ubb38\uc790\uac00 \ub098\ud0c0\ub098\ub294 \ud69f\uc218 \ub610\ub294 \ubc94\uc704\ub97c \ub098\ud0c0\ub0c4\n\n\uc608 : a{3} ('a'\uc758 3\ubc88 \ubc18\ubcf5\uc778 aaa\ub9cc \ud574\ub2f9\ub428)\n\na{3,} ('a'\uac00 3\ubc88 \uc774\uc0c1 \ubc18\ubcf5\uc778 aaa, aaaa, aaaa, ... \ub4f1\uc744 \ub098\ud0c0\ub0c4)\n\na{3,5} (aaa, aaaa, aaaaa \ub9cc \ud574\ub2f9\ub428)\n\nab{2,3} (abb\uc640 abbb \ub9cc \ud574\ub2f9\ub428)\n\n&#91;0-9]{2} (\ub450 \uc790\ub9ac \uc22b\uc790)\n\ndoc&#91;7-9]{2} (doc77, doc87, doc97 \ub4f1\uc774 \ud574\ub2f9)\n\n&#91;^Zz]{5} (Z\uc640 z\ub97c \ud3ec\ud568\ud558\uc9c0 \uc54a\ub294 5\uac1c\uc758 \ubb38\uc790\uc5f4, abcde, ttttt \ub4f1\uc774 \ud574\ub2f9)\n\n.{3,4}er ('er'\uc55e\uc5d0 \uc138 \uac1c \ub610\ub294 \ub124 \uac1c\uc758 \ubb38\uc790\ub97c \ud3ec\ud568\ud558\ub294 \ubb38\uc790\uc5f4\uc774\ubbc0\ub85c Peter, mother \ub4f1\uc774 \ud574\ub2f9)\n\n(6) * (asterisk) : \"*\" \uc9c1\uc804\uc758 \uc120\ud589\ubb38\uc790\uac00 0\ubc88 \ub610\ub294 \uc5ec\ub7ec\ubc88 \ub098\ud0c0\ub098\ub294 \ubb38\uc790\uc5f4\n\n\uc608 : ab*c ('b'\ub97c 0\ubc88 \ub610\ub294 \uc5ec\ub7ec\ubc88 \ud3ec\ud568\ud558\ubbc0\ub85c ac, ackdddd, abc, abbc, abbbbbbbc \ub4f1)\n\n* (\uc120\ud589\ubb38\uc790\uac00 \uc5c6\ub294 \uacbd\uc6b0\uc774\ubbc0\ub85c \uc784\uc758\uc758 \ubb38\uc790\uc5f4 \ubc0f \uacf5\ubc31 \ubb38\uc790\uc5f4\ub3c4 \ud574\ub2f9\ub428)\n\n.* (\uc120\ud589\ubb38\uc790\uac00 \".\"\uc774\ubbc0\ub85c \ud558\ub098 \uc774\uc0c1\uc758 \ubb38\uc790\ub97c \ud3ec\ud568\ud558\ub294 \ubb38\uc790\uc5f4, \uacf5\ubc31 \ubb38\uc790\uc5f4\uc740 \uc548\ub428)\n\nab* ('b'\ub97c 0\ubc88 \ub610\ub294 \uc5ec\ub7ec\ubc88 \ud3ec\ud568\ud558\ubbc0\ub85c a, accc, abb, abbbbbbb \ub4f1)\n\na* ('a'\ub97c 0\ubc88 \ub610\ub294 \uc5ec\ub7ec\ubc88 \ud3ec\ud568\ud558\ubbc0\ub85c k, kdd, sdfrrt, a, aaaa, abb, \uacf5\ubc31\ubb38\uc790\uc5f4 \ub4f1)\n\ndoc&#91;7-9]* (doc7, doc777, doc778989, doc \ub4f1\uc774 \ud574\ub2f9)\n\n&#91;A-Z].* (\ub300\ubb38\uc790\ub85c\ub9cc \uc774\ub8e8\uc5b4\uc9c4 \ubb38\uc790\uc5f4)\n\nlike.* (\uc9c1\uc804\uc758 \uc120\ud589\ubb38\uc790\uac00 '.'\uc774\ubbc0\ub85c like\uc5d0 0 \ub610\ub294 \ud558\ub098 \uc774\uc0c1\uc758 \ubb38\uc790\uac00 \ucd94\uac00\ub41c \ubb38\uc790\uc5f4\uc774 \ub428, like, likely, liker, likelihood \ub4f1)\n\n(7) + (asterisk) : \"+\" \uc9c1\uc804\uc758 \uc120\ud589\ubb38\uc790\uac00 1\ubc88 \uc774\uc0c1 \ub098\ud0c0\ub098\ub294 \ubb38\uc790\uc5f4\n\n\uc608 : ab+c ('b'\ub97c 1\ubc88 \ub610\ub294 \uc5ec\ub7ec\ubc88 \ud3ec\ud568\ud558\ubbc0\ub85c abc, abckdddd, abbc, abbbbbbbc \ub4f1, ac\ub294 \uc548\ub428)\n\nab+ ('b'\ub97c 1\ubc88 \ub610\ub294 \uc5ec\ub7ec\ubc88 \ud3ec\ud568\ud558\ubbc0\ub85c ab, abccc, abb, abbbbbbb \ub4f1)\n\nlike.+ (\uc9c1\uc804\uc758 \uc120\ud589\ubb38\uc790\uac00 '.'\uc774\ubbc0\ub85c like\uc5d0 \ud558\ub098 \uc774\uc0c1\uc758 \ubb38\uc790\uac00 \ucd94\uac00\ub41c \ubb38\uc790\uc5f4\uc774 \ub428, likely, liker, likelihood \ub4f1, \uadf8\ub7ec\ub098 like\ub294 \ud574\ub2f9\uc548\ub428)\n\n&#91;A-Z]+ (\ub300\ubb38\uc790\ub85c\ub9cc \uc774\ub8e8\uc5b4\uc9c4 \ubb38\uc790\uc5f4)\n\n(8) ? (asterisk) : \"?\" \uc9c1\uc804\uc758 \uc120\ud589\ubb38\uc790\uac00 0\ubc88 \ub610\ub294 1\ubc88 \ub098\ud0c0\ub098\ub294 \ubb38\uc790\uc5f4\n\n\uc608 : ab?c ('b'\ub97c 0\ubc88 \ub610\ub294 1\ubc88 \ud3ec\ud568\ud558\ubbc0\ub85c abc, abcd \ub9cc \ud574\ub2f9\ub428)\n\n(9) () (parenthesis) : ()\ub294 \uc815\uaddc\uc2dd\ub0b4\uc5d0\uc11c \ud328\ud134\uc744 \uadf8\ub8f9\ud654 \ud560 \ub54c \uc0ac\uc6a9\n\n(10) | (bar) : or\ub97c \ub098\ud0c0\ub0c4\n\n\uc608 : a|b|c (a, b, c \uc911 \ud558\ub098, \uc989 &#91;a-c]\uc640 \ub3d9\uc77c\ud568)\n\nyes|Yes (yes\ub098 Yes \uc911 \ud558\ub098, &#91;yY]es\uc640 \ub3d9\uc77c\ud568)\n\nkorea|japan|chinese (korea, japan, chinese \uc911 \ud558\ub098)\n\n(11) \\ (backslash) : \uc704\uc5d0\uc11c \uc0ac\uc6a9\ub41c \ud2b9\uc218 \ubb38\uc790\ub4e4\uc744 \uc815\uaddc\uc2dd\ub0b4\uc5d0\uc11c \ubb38\uc790\ub97c \ucde8\uae09\ud558\uace0 \uc2f6\uc744 \ub54c '\\'\ub97c \uc120\ud589\uc2dc\ucf1c\uc11c \uc0ac\uc6a9\ud558\uba74\ub428\n\n\uc608 : filename\\.ext (\"filename.ext\"\ub97c \ub098\ud0c0\ub0c4)\n\n&#91;\\?\\&#91;\\\\\\]] ('?', '&#91;', '\\', ']' \uc911 \ud558\ub098)\n\n\n\uc815\uaddc\uc2dd\uc5d0\uc11c\ub294 \uc704\uc5d0\uc11c \uc5b8\uae09\ud55c \ud2b9\uc218 \ubb38\uc790\ub97c \uc81c\uc678\ud55c \ub098\uba38\uc9c0 \ubb38\uc790\ub4e4\uc740 \uc77c\ubc18 \ubb38\uc790\ub85c \ucde8\uae09\ud568\n\n\n\uc815\uaddc\uc2dd\uc740 Unix\uc758 \ub300\ud45c\uc801\uc778 \uc720\ud2f8\ub9ac\ud2f0\uc778 vi, emacs, ed, sed, awk, grep, egrep \ub4f1\uc5d0\uc11c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4. \ub2e4\uc74c\uc740 grep\uc5d0\uc11c \uc815\uaddc\uc2dd\uc744 \ud65c\uc6a9\ud55c \uc608\ub97c \ubcf4\uc5ec \uc8fc\uace0 \uc788\ub2e4.\n\n(1) $ \uba85\ub839\uc5b4 | grep '\uc815\uaddc\uc2dd'\n\n&lt;= \uba85\ub839\uc5b4\uc758 \uacb0\uacfc\ub97c grep\uc774 \uc785\ub825\ubc1b\uc544 \uc815\uaddc\uc2dd\uc744 \uc774\uc6a9\ud558\uc5ec \ud328\ud134\uc744 \ucc3e\uc544\ub0c4\n\n\uc608 : $ who | grep 'hgkim' &lt;= hgkim\uc774\ub77c\ub294 \uc0ac\uc6a9\uc790\uac00 login \ud574 \uc788\ub294\uc9c0\ub97c \uc54c\uc544\ubd04\n\n$ ls -al | grep '^d.*' &lt;= ls -al \uc758 \uacb0\uacfc 'd'\ub85c \uc2dc\uc791\ud558\ub294 \ub77c\uc778(\uc989 \ub514\ub809\ud1a0\ub9ac\ub4e4)\n\n\ub9cc\uc744 \ucd9c\ub825\n\n$ ls -al | grep '^d.*' &lt;= ls -al \uc758 \uacb0\uacfc 'd'\ub85c \uc2dc\uc791\ud558\ub294 \ub77c\uc778(\uc989 \ub514\ub809\ud1a0\ub9ac\ub4e4)\n\n\ub9cc\uc744 \ucd9c\ub825\n\n$ ls -al | grep '^&#91;^d]..x..x..x' &lt;= \ub514\ub809\ud1a0\ub9ac\ub294 \uc81c\uc678\ud558\uace0(\"&#91;^d]\") \ub204\uad6c\ub098\n\n\uc2e4\ud589\uac00\ub2a5\ud55c \ud30c\uc77c(\"..x..x..x\")\ub4e4 \ucc3e\uae30\n\n(2) $ grep '\uc815\uaddc\uc2dd' \ud30c\uc77c\uc774\ub984\n\n&lt;= \ud30c\uc77c\uc744 \uc785\ub825\ubc1b\uc544 \uc815\uaddc\uc2dd\uc744 \uc774\uc6a9\ud558\uc5ec \ud328\ud134\uc744 \ucc3b\uc544\ub0c4\n\n\uc608: $ grep 'telnet' \/etc\/inetd.conf\n\n\n\uc774\uc678\uc758 \uba85\ub839\uc5b4\ub4e4\ub3c4 grep\uacfc \uc720\uc0ac\ud55c \ud615\ud0dc\ub85c \uc774\uc6a9\ub41c\ub2e4. \ub530\ub77c\uc11c \uc815\uaddc\uc2dd\uc744 \uc798 \uc774\uc6a9\ud558\uba74 \uc720\ub2c9\uc2a4\uc758 \ud65c\uc6a9\uc774 \ubc30\uac00 \ub420 \uac83\uc774\ub2e4.\n\n \n\nPHP\uc5d0\uc11c\ub294 \uc815\uaddc\uc2dd\uacfc \uad00\ub828\ud558\uc5ec \ub2e4\uc74c\uc758 \ub124\uac00\uc9c0 \ud568\uc218\ub97c \uc81c\uacf5\ud55c\ub2e4.\n\n\nint ereg(string givenPattern, string givenString, array matched);\n\n- givenString\uc744 \"string1stringAstring2stringBstring3 ... string9stringI\" \ub85c \uc8fc\uc5b4\uc838 \uc788\ub2e4\uace0 \ud558\uc790. \uc774\ub54c stringA, stringB, ... , stringI\ub294 NULL \uc774\uc5b4\ub3c4 \uc0c1\uad00\uc774 \uc5c6\ub2e4(\uc989 givenString\uc740 \"string1string2string3 ... string9\" \uc778 \uacbd\uc6b0\uc784).\n\n- givenString\uc774 \uc704\uc640 \uac19\uc774 \uc8fc\uc5b4\uc9c4 \uacbd\uc6b0,\n\ngivenPattern\uc740 \"(pattern1)stringA(pattern2)stringB(pattern3) ... (pattern9)stringI\"\ub85c \uc785\ub825\ud558\uc5ec\uc57c \ud55c\ub2e4. \uc989 pattern1, pattern2, ..., pattern9\ub294 \uac01\uac01 string1, string2, ... , string9\uc5d0\uc11c \ucc3e\uace0\uc790\ud558\ub294 \uc815\uaddc\uc2dd\uc778 \uac83\uc774\ub2e4.\n\n- \uc774\ub54c pattern1\uc774 string1\uc5d0\uc11c \ubc1c\uacac\ud55c \ud328\ud134\uc740 $matched&#91;1]\uc5d0 \uc800\uc7a5\ub418\uace0, pattern2\uac00 string2\uc5d0\uc11c \ubc1c\uacac\ud55c \ud328\ud134\uc740 $matched&#91;2]\uc5d0 \uc800\uc7a5\ub418\uace0, ..., pattern9\uac00 string9\uc5d0\uc11c \ubc1c\uacac\ud55c \ud328\ud134\uc740 $matched&#91;9]\uc5d0 \uc800\uc7a5\ub41c\ub2e4. PHP3\uc758 \uacbd\uc6b0 ereg\uc5d0\uc11c\ub294 \ucd5c\ub300 9\uac1c \uae4c\uc9c0\uc758 pattern\uc744 \ucc3e\uc744 \uc218 \uc788\ub3c4\ub85d \uc124\uc815\ub418\uc5b4 \uc788\uc74c\uc5d0 \uc720\uc758\ud558\uc790.\n\n- \uadf8\ub9ac\uace0 $matched&#91;0]\uc5d0\ub294 $matched&#91;1]stringA$matched&#91;2]stringB ... $matched&#91;9]stringI\uac00 \uc800\uc7a5\ub41c\ub2e4.\n\n- ereg\uac00 \ubc18\ud658\ud558\ub294 \uac12\uc740 $matched&#91;0]\uc5d0 \uc800\uc7a5\ub41c \ubb38\uc790\uc5f4\uc758 \uac1c\uc218\uc774\ub2e4.\n\n- ereg\ub294 case sensitive\n\n- eregi\ub294 case insensitive\n\n\n\uc6081 :\n\n\ucf54\ub4dc => print(ereg (\"(.*)ef(&#91;abc].*)\",\"abcdefabc\",$matched));\n\nprint(\"&lt;br>\");\n\nwhile (list($a,$b)=each($matched))\n\nif ($b)\n\nprint(\"$a, $b &lt;br>\");\n\n\uacb0\uacfc => 9\n\n0, abcdefabc\n\n1, abcd\n\n2, abc\n\n\uc6082 :\n\n\ucf54\ub4dc => print(ereg (\"(.*)d(.*)e(.*)qrs(.*)\",\"abcdefghijklmnopqrstuvwxyz\",$matched));\n\nprint(\"&lt;br>\");\n\nwhile (list($a,$b)=each($matched))\n\nif ($b)\n\nprint(\"$a, $b &lt;br>\");\n\n\uacb0\uacfc => 26\n\n0, abcdefghijklmnopqrstuvwxyz\n\n1, abc\n\n3, fghijklmnop\n\n4, tuvwxyz\n\n\uc608 3 :\n\n\ucf54\ub4dc => $date=\"1999-11-17\";\n\nif (ereg(\"(&#91;0-9]{4})-(&#91;0-9]{1,2})-(&#91;0-9]{1,2})\", $date, $regs))\n\nprint(\"$regs&#91;3].$regs&#91;2].$regs&#91;1]\");\n\nelse print(\"Invalid date format: $date\");\n\n\uacb0\uacfc => 17.11.1999\n\n\uc608 4 :\n\n\ucf54\ub4dc => $joomin=\"711011-1234567\";\n\nif (ereg(\"(&#91;0-9]{2})(&#91;01]{1}&#91;09]{1}&#91;0-3]{1}&#91;0-9]{1})-(&#91;12]{1}&#91;0-9]{6})\",$date, $regs))\n\nprint(\"Valid\");\n\nelse print(\"Invalid format: $joomin\");\n\n\nint eregi(string givenPattern, string givenString, array matched);\n\n- ereg\uc758 'case insensitive' \ubc84\uc83c\n\n\n\uc608 :\n\n\ucf54\ub4dc => $email=\"xs9_tx-abc.yyy_c@cne.kyungsung.ac.kr\";\n\neregi(\"(^&#91;_\\.0-9a-z-]+)@((&#91;0-9a-z]&#91;0-9a-z-]+\\.)+)(&#91;a-z]{2,3}$)\",$email,$matched)\n;\n\nwhile (list($a,$b)=each($matched))\n\nif ($b) print(\"$a, $b &lt;br>\");\n\n\n\uacb0\uacfc => 0, xs9_tx-abc.yyy_c@cne.kyungsung.ac.kr\n\n1, xs9_tx-abc.yyy_c\n\n2, cne.kyungsung.ac.\n\n3, ac.\n\n4, kr\n\n \n\n\ucf54\ub4dc => eregi(\"^&#91;_\\.0-9a-z-]+@(&#91;0-9a-z]&#91;0-9a-z-]+\\.)+&#91;a-z]{2,3}$\",$email,$matched);\n\nwhile (list($a,$b)=each($matched))\n\nif ($b) print(\"$a, $b &lt;br>\");\n\n\uacb0\uacfc => 0, xs9_tx-abc.yyy_c@cne.kyungsung.ac.kr\n\n1, ac.\n\n \n\nstring ereg_replace(string givenPattern, string replacementPattern, string givenString);\n\n- givenString\uc5d0\uc11c givenPattern\uc5d0 \ubd80\ud569\ud558\ub294 \ud14d\uc2a4\ud2b8(matched text)\ub97c \ucc3e\uc544\uc11c,\n\nreplacementPattern\uc73c\ub85c \ub300\uccb4\n\n- givenPattern\uc774 \"(\ud328\ud134)\"\uc73c\ub85c \ubb36\uc778 \ubb38\uc790\uc5f4\ub4e4\uc744 \ud3ec\ud568\ud558\uace0 \uc788\uc73c\uba74, replacementPattern\uc5d0\ub294 \uc774\uc5d0 \ub300\uc751\ud558\ub294 \"\\\\digit(\ubb38\uc790\uc5f4)\" \ud615\ud0dc\uc758 \ubb38\uc790\uc5f4\ub4e4\uc744 \ud3ec\ud568\ud558\uace0 \uc788\uc5b4\uc57c \ud55c\ub2e4(digit\ub294 0, 1, ... ,9 \uc911 \ud558\ub098). \uadf8\ub9ac\uace0 givenString\uc740 \"(\ud328\ud134)\"\uc744 \uc774\uc6a9\ud574 \ucc3e\uc740 \uacb0\uacfc\ub4e4\uc744 \"\\\\digit(\ubb38\uc790\uc5f4)\"\uc5d0 \uc788\ub294 \"\ubb38\uc790\uc5f4\"\ub4e4\ub85c \ub300\uccb4\ud558\uac8c \ub41c\ub2e4. \"\\\\0\" \ub294 givenString \uc804\uccb4\uc5d0 \ub300\ud574 \"(\ud328\ud134)\"\uc758 \uacb0\uacfc\ub97c \uc801\uc6a9\ud560 \ub54c \uc774\uc6a9\ub41c\ub2e4.\n\n- \ubcc0\uacbd\ub41c \ubb38\uc790\uc5f4\uc744 \ub9ac\ud134\n\n- case sensitive\n\n\n\uc608 :\n\n\ucf54\ub4dc => $string = \"This is a test\";\n\nprint(ereg_replace(\" is\", \" was\",$string)); print(\"&lt;br>\");\n\nprint(ereg_replace(\"( )is\",\"\\\\1was\",$string)); print(\"&lt;br>\");\n\nprint(ereg_replace(\"(( )is)\",\"\\\\2was\",$string)); print(\"&lt;br>\");\n\nprint(ereg_replace(\"(( )is)(( )a)(( )test)\", \"\\\\1was\\\\2an\\\\3exam\",$string));\n\n\uacb0\uacfc => \"This was a test\";\n\n\"This was a test\";\n\n\"This was a test\";\n\n\"This was an exam\";\n\n\n\uc608 2 : redundant whitespace \uc5c6\uc560\uae30\n\n\ucf54\ub4dc => $str =\"~ s\/\\s+\/ \/g\";\n\n$str = eregi_replace(\"&#91;&#91;:space:]]+\", \" \", $str);\n\nprint(\"$str&lt;br>\");\n\n\uacb0\uacfc => ~ s\/\\s+\/ \/g\n\n\nstring eregi_replace(string givenPattern, string replacementPattern, string givenString);\n\n- ereg_replace\uc758 'case insensitive' \ubc84\uc83c<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":1251,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-565","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-php"],"_links":{"self":[{"href":"https:\/\/inwelly.com\/index.php?rest_route=\/wp\/v2\/posts\/565","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/inwelly.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/inwelly.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/inwelly.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/inwelly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=565"}],"version-history":[{"count":1,"href":"https:\/\/inwelly.com\/index.php?rest_route=\/wp\/v2\/posts\/565\/revisions"}],"predecessor-version":[{"id":566,"href":"https:\/\/inwelly.com\/index.php?rest_route=\/wp\/v2\/posts\/565\/revisions\/566"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/inwelly.com\/index.php?rest_route=\/wp\/v2\/media\/1251"}],"wp:attachment":[{"href":"https:\/\/inwelly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=565"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/inwelly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=565"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/inwelly.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=565"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}