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PHP support two types of Regular Expressions. 1.] Perl compatible syntax using the PCRE function. 2.] POSIX-extended regular expression syntax PCRE functions are binary safe but POSIX are not. The functions that supports regular expressions are ereg() ereg_replace() eregi() eregi_replace() split() spliti() ereg() ====== syntax :: int ereg (string pattern, string string [, array regs]) Searches a string for matches to the regular expression given in pattern. If the matches are found, will be stored in regs array. $reg[0] will contains a copy of complete match string. Search is case sensitive. The following code snippet takes date in YYYY/MM/DD format and print it in DD/MM/YYYY format. <? $da=getdate(); $datestamp="$da[year]/$da[mon]/$da[mday]"; echo $datestamp . "<br>"; if (ereg("([0-9]{4})/([0-9]{1,2})/([0-9]{1,2})",$datestamp,$regs)){ echo $regs[3]."-".$regs[2]."-".$regs[1]."<br>"; echo $regs[0]; }else{ echo "Invalid Date format"; } ?> ereg_replace() ============== syntax :: string ereg_replace (string pattern, string replacement, string string) This function scans string for matches to pattern, then replaces the matched text with replacement. This function doesnt modify the original string , it return a new string. In the following example : replaces the word colon <? $str="colon colon netrpx the simple web directory colon colon"; $newstr=ereg_replace("colon",":",$str); echo $newstr; ?> eregi() ======= This function is identical to ereg() except that this ignores case distinction when matching alphabetic characters. eregi_replace() ============== This function is identical to ereg_replace() except that this ignores case distinction when matching alphabetic characters. split() ======= syntax :: array split (string pattern, string string [, int limit]) If limit is set, the returned array will contain a maximum of limit elements with the last element containing the whole rest of string. To parse a date which may be delimited with slashes, dots, or hyphens: <? $da=getdate(); $datestamp="$da[year]/$da[mon]/$da[mday]"; echo $datestamp . "<br>"; list ($year, $month, $day) = split ('[/.-]', $datestamp); echo $year."<br>"; echo $month."<br>"; echo $day."<br>"; ?> spliti() ======== This function is identical to split() except that this ignores case distinction when matching alphabetic characters. | |||||
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