Converting Java Regex to Javascript Regex

Question

I have a regular expression in java

^.*(?=.{8,})(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[!()*,/:;<>?\\\]\[\-_`{}~@#$%^&+=]).*$

It matches strings which having these conditions:

at least 8 characters
at least one digit
at least one small letter
at least one capital letter
at least one special character
```
[!()*,/:;<>?\\\]\[\-_`{}~@#$%^&+=]
```

How can I convert it into a JavaScript regex?

taggon · Accepted Answer · 2012-05-29 16:20:10Z

3

Simple solution with simple regex.

var re = /^(.{0,7}|\D+|[^a-z]+|[^A-Z]+|[^\^!@#$%&\*])$/;
if (!re.test(str)) {
    alert('Matched');
}

Note that there are some missing special characters in my regex.

answered May 29, 2012 at 16:20

taggon

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3 Comments

Bilal Over a year ago

It's a very good idea to see thing in negative way. But it's not giving exact result. Please see this jsfiddle.

Ry- Over a year ago

Simple solution with simple regex that doesn't work. aaaaaaa

taggon Over a year ago

@BilalMirza You should escape - sign. updated jsfiddle

Hunter McMillen · Accepted Answer · 2012-05-29 13:23:22Z

3

put two forward slashes around it:

var re = /<your_regex_here>/;

answered May 29, 2012 at 13:23

Hunter McMillen

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Comments

Ry- · Accepted Answer · 2012-05-29 13:23:04Z

2

It already works in JavaScript:

var re = /^.*(?=.{8,})(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[!()*,/:;<>?\\\]\[\-_`{}~@#$%^&+=]).*$/;
re.test('abcdefgh0A$') // true

answered May 29, 2012 at 13:23

Ry-♦

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4 Comments

Bilal Over a year ago

I hava a created a jsfiddle. All given strings are valid but it does not match some of strings. Am I missing something there?

Ry- Over a year ago

@BilalMirza: First, a tip: use regular expression literals, like I did in the example with slashes - never new RegExp, which is almost always a bad idea. Next, no, they're not all valid... ptiLad4emp9, for example, does not contain a symbol.

Bilal Over a year ago

You are right. that all strings are not valid. I wonder why did I noticed that. But why new RegExp() is a bad idea?

Ry- Over a year ago

@BilalMirza: Just because you have to remember to escape everything, and it's also slightly slower (think eval).

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