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preg_match长字符串匹配失败问题解决

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Release： 2016-06-13 10:47:27
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今天在查一个问题，用正则从字符串中提取内容失败，反复检查字符串和正则表达式，都没有问题。又写了小脚本测试，还没有问题，回到代码中调试，又失败了。
字符串比较长，因此怀疑是不是preg_match也有字符串长度限制，果然！
preg_match、preg_match_all都会有这种情况。
 
解决方法：
1、ini_set(‘pcre.backtrack_limit’, 1000000); //默认的只有100000
2、修改php.ini 的pcre.backtrack_limit参数，使之支持更大的字符串。加入配置：pcre.backtrack_limit=-1
 

摘自 编码者说

Related labels：
match content match exist fail string extract check solve question
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