{"id":1124,"date":"2015-04-20T18:21:50","date_gmt":"2015-04-20T10:21:50","guid":{"rendered":"http:\/\/www.821121.com\/?p=1124"},"modified":"2020-12-16T18:22:11","modified_gmt":"2020-12-16T10:22:11","slug":"oracle-sql%e8%af%ad%e5%8f%a5-%e4%b9%8b-regexp_substr%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"http:\/\/www.821121.com\/?p=1124","title":{"rendered":"Oracle SQL\u8bed\u53e5 \u4e4b regexp_substr\u51fd\u6570"},"content":{"rendered":"<h1>\u5b9a\u4e49<\/h1>\n<p>regexp_substr()\u51fd\u6570\uff0c\u5373\u5728substr\u51fd\u6570\u4e2d\u52a0\u5165\u6b63\u5219\u8868\u8fbe\u5f0f\u8fdb\u884c\u5bf9\u6307\u5b9a\u5b57\u7b26\u4e32\u7684\u622a\u53d6\u3002<\/p>\n<h1>\u8bed\u6cd5<\/h1>\n<p>REGEXP_SUBSTR(String, pattern, position, occurrence, modifier)\u3002<br \/>\n\u5176\u4e2d\uff1a<br \/>\nstring\uff1a\u9700\u8981\u8fdb\u884c\u6b63\u5219\u5904\u7406\u7684\u5b57\u7b26\u4e32\uff1b<br \/>\npattern\uff1a\u8fdb\u884c\u5339\u914d\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\uff1b<br \/>\nposition\uff1a\u8d77\u59cb\u4f4d\u7f6e\uff0c\u4ece\u5b57\u7b26\u4e32\u7684\u7b2c\u51e0\u4e2a\u5b57\u7b26\u5f00\u59cb\u6b63\u5219\u8868\u8fbe\u5f0f\u5339\u914d\uff08\u9ed8\u8ba4\u4e3a1\uff09\uff0c\u6ce8\u610f\uff1a\u5b57\u7b26\u4e32\u6700\u521d\u7684\u4f4d\u7f6e\u662f1\u800c\u4e0d\u662f0\uff1b<br \/>\noccurrence\uff1a\u83b7\u53d6\u7b2c\u51e0\u4e2a\u5206\u5272\u51fa\u6765\u7684\u7ec4\uff08\u5206\u5272\u540e\u6700\u521d\u7684\u5b57\u7b26\u4e32\u4f1a\u6309\u5206\u5272\u7684\u987a\u5e8f\u6392\u5217\u6210\u7ec4\uff09\uff1b<br \/>\nmodifier\uff1a\u6a21\u5f0f\uff08\u2018i\u2019\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u8fdb\u884c\u68c0\u7d22\uff1b\u2018c\u2019\u533a\u5206\u5927\u5c0f\u5199\u8fdb\u884c\u68c0\u7d22\u3002\u9ed8\u8ba4\u4e3a\u2019c\u2019\uff09\u9488\u5bf9\u7684\u662f\u6b63\u5219\u8868\u8fbe\u5f0f\u91cc\u5b57\u7b26\u5927\u5c0f\u5199\u7684\u5339\u914d\u3002<\/p>\n<p>\u540c\u65f6\uff0c\u5217\u51fa\u51e0\u4e2a\u5e38\u7528\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\uff1a<br \/>\n1\uff09^[\\u4e00-\\u9fa5] \/\/\u5339\u914d\u4e2d\u6587\u5b57\u7b26\uff1b<br \/>\n2\uff09^[1-9]\\d*$ \/\/\u5339\u914d\u6b63\u6574\u6570\uff1b<br \/>\n3\uff09^[A-Za-z]+$ \/\/\u5339\u914d\u753126\u4e2a\u82f1\u6587\u5b57\u6bcd\u7ec4\u6210\u7684\u5b57\u7b26\u4e32\uff1b<br \/>\n4\uff09^[A-Z]+$ \/\/\u5339\u914d\u753126\u4e2a\u82f1\u6587\u5b57\u6bcd\u7684\u5927\u5199\u7ec4\u6210\u7684\u5b57\u7b26\u4e32\uff1b<br \/>\n5\uff09^[a-z]+$ \/\/\u5339\u914d\u753126\u4e2a\u82f1\u6587\u5b57\u6bcd\u7684\u5c0f\u5199\u7ec4\u6210\u7684\u5b57\u7b26\u4e32\uff1b<br \/>\n6\uff09^[A-Za-z0-9]+$ \/\/\u5339\u914d\u7531\u6570\u5b57\u548c26\u4e2a\u82f1\u6587\u5b57\u6bcd\u7ec4\u6210\u7684\u5b57\u7b26\u4e32\uff1b<\/p>\n<h1>\u8fd4\u56de\u503c\u7c7b\u578b<\/h1>\n<p>\u5b57\u7b26\u4e32<\/p>\n<h1>\u4e3e\u4f8b<\/h1>\n<h2>\u672a\u52a0\u51fd\u6570<\/h2>\n<pre><code class=\"language-sql\">select a.value from test a<\/code><\/pre>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2020\/12\/image-1608113937863.png\" alt=\"file\" \/><\/p>\n<h2>\u52a0\u5165\u51fd\u6570<\/h2>\n<pre><code class=\"language-sql\">select regexp_substr(a.value,&#039;[0-9]+&#039;,1,1,&#039;i&#039;) from test a<\/code><\/pre>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2020\/12\/image-1608114039887.png\" alt=\"file\" \/><\/p>\n<pre><code class=\"language-sql\">select regexp_substr(a.value,&#039;[0-1]+&#039;,1,1,&#039;i&#039;) from test a<\/code><\/pre>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2020\/12\/image-1608114067448.png\" alt=\"file\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b9a\u4e49 regexp_substr()\u51fd\u6570\uff0c\u5373\u5728su<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[48],"tags":[],"class_list":["post-1124","post","type-post","status-publish","format-standard","hentry","category-sql"],"_links":{"self":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1124","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1124"}],"version-history":[{"count":2,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1124\/revisions"}],"predecessor-version":[{"id":1136,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1124\/revisions\/1136"}],"wp:attachment":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1124"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1124"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1124"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}