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--- php [2021/05/01 11:36] – admin
+++ php [2021/05/02 11:26] (current) – admin
@@ Line 5: / Line 5: @@
 Start php server ```php -S 127.0.0.1:8000```\\
 Open browser and enter ```http://localhost:8000/file-name.php```
+## Regular Expression
+https://regexr.com
+### Flags
+https://javascript.info/regexp-introduction Regular expressions may have flags that affect the search.
+There are only 6 of them in JavaScript:
+<file>
+i
+With this flag the search is case-insensitive: no difference between A and a (see the example below).
+g
+With this flag the search looks for all matches, without it – only the first match is returned.
+m
+Multiline mode (covered in the chapter Multiline mode of anchors ^ $, flag "m").
+s
+Enables “dotall” mode, that allows a dot . to match newline character \n (covered in the chapter Character classes).
+u
+Enables full Unicode support. The flag enables correct processing of surrogate pairs. More about that in the chapter Unicode: flag "u" and class \p{...}.
+y
+“Sticky” mode: searching at the exact position in the text (covered in the chapter Sticky flag "y", searching at position)
+</file>