浅析Perl正则表达式在PHP的实现
Perl正则表达式在PHP的实现达成,我们要使用PCRE相关的正则表达式函数,那么具体的都有什么函数呢?这里我们向你介绍4个,希望对你有所帮助。
Perl正则表达式在PHP的实现所使用的函数介绍:
1、preg_match :
函数格式:
<ol class="dp-c"><li class="alt"><span><span>int preg_match(string pattern, string subject, </span><span class="keyword">array</span><span> [matches]); </span></span></li></ol>
这个函数会在string中使用pattern表达式来匹配,如果给定了[regs],就会将string记录到[regs][0]中,[regs][1]代表使用括号"()"记录下来的第一个字符串,[regs][2]代表记录下来的第二个字符串,以此类推。preg如果在string中找到了匹配的pattern,就会返回"true",否则返回"false"。
2、preg_replace :
函数格式:
<ol class="dp-c"><li class="alt"><span><span>mixed preg_replace(mixed pattern, mixed replacement, mixed subject); </span></span></li></ol>
这个函数会使用将string中符合表达式pattern的字符串全部替换为表达式replacement。如果replacement中需要包含pattern的部分字符,则可以使用"()"来记录,在replacement中只是需要用"

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