PHP regexp match slash

Question

I have the following regular expression tested at regex101 and it works there. However, when I try to use it inside the preg_match it doesn't work anymore. The problem is the slash: I tried escaping it but I can't get it working.

preg_match("/[<>\\\"'%;()&]/", "my\string");

The set of characters that I should match are:

< > \ " ' % ; ( ) &

Yogu · Accepted Answer · 2013-02-07 18:25:46Z

4

Simply use a different delimiter:

preg_match("![<>\\\"'%;()&/]!", "my\string");

answered Feb 7, 2013 at 18:25

Yogu

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2 Comments

Stefano Over a year ago

thank you but what if I want to use the / as delimiter? I found that using 4 slashes to match a single \ works but I can't understand why I need that amount of characters

Yogu Over a year ago

What is the point in using / as delimiter, if you want to use it as character? `` is a different question: First, you need to escape the backslash in the regular expression (-> 2 backslashes), then these two backslashes in PHP (-> 4 backslashes)

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