Regular expression for ng-pattern to validate file paths

Question

Regular expression for ng-pattern to validate file paths

I have created a regex for file paths with specific conditions:

It must match the regex
```
^(\\\\[^\\]+\\[^\\]+|https?://[^/]+)
```
, which means it can be a network path like \server\share (optionally followed by one or more "\folder"s), or an HTTP(S) URL
It should not contain any invalid characters in a path name, such as ", <, >, |

Is there a way to create a single regex to use in angular.js that satisfies these requirements?

javascript angularjs regex regex-negation angularjs-ng-pattern

Answer 1

Answer №1

Your current regular expression does not appear to be matching what you need. However, if it is working as intended, the following modification can be made to include a negation:

^(?!.*[ "<>|])(\\\\[^\\]+\\[^\\]+|https?://[^/]+)

Incorporating a negative lookahead allows us to check if any prohibited characters are present in the string before continuing with the rest of the pattern.

If I have correctly understood your requirements, you might consider this alternative approach:

^(?!.*[ "<>|])(\\\\|https?://).*$

This revised expression still excludes invalid characters identified by the negative lookahead while meeting the conditions for matching one or more path segments as well as http(s), and it offers simplicity.

It is worth noting that if your criteria call for 2 or more path segments or a trailing slash in the URL, the proposed solution may not suffice. Your original regex implies these additional specifications.

To account for multiple path segments or a trailing slash, a slightly modified version could be used:

^(?!.*[ "<>|])(\\\\[^\\]+\\.|https?://[^/]+/).*$

Furthermore, the request to match \server\share should actually read \\server\share. Therefore, all instances of \\\\ in the provided examples should be adjusted to \\ if this clarification applies.

Answer 2

Your current regular expression does not appear to be matching what you need. However, if it is working as intended, the following modification can be made to include a negation:

^(?!.*[ "<>|])(\\\\[^\\]+\\[^\\]+|https?://[^/]+)

Incorporating a negative lookahead allows us to check if any prohibited characters are present in the string before continuing with the rest of the pattern.

If I have correctly understood your requirements, you might consider this alternative approach:

^(?!.*[ "<>|])(\\\\|https?://).*$

This revised expression still excludes invalid characters identified by the negative lookahead while meeting the conditions for matching one or more path segments as well as http(s), and it offers simplicity.

It is worth noting that if your criteria call for 2 or more path segments or a trailing slash in the URL, the proposed solution may not suffice. Your original regex implies these additional specifications.

To account for multiple path segments or a trailing slash, a slightly modified version could be used:

^(?!.*[ "<>|])(\\\\[^\\]+\\.|https?://[^/]+/).*$

Furthermore, the request to match \server\share should actually read \\server\share. Therefore, all instances of \\\\ in the provided examples should be adjusted to \\ if this clarification applies.

Answer 3

Answer №2

Alright, let's start with the regular expression and then move on to the explanation:

(?<folderorurl>(?<folder>(\\[^\\\s",<>|]+)+)|(?<url>https?:\/\/[^\s]+))

The first condition is to match a folder name that should not contain any characters like ", <, >, or |, as well as no whitespaces. This part is denoted as:

[^\s,<>|] # using the caret to negate the character class

In addition, we want to allow for optional subfolders following the main folder name. To achieve this, we need to include a backslash in the character class:

[^\\\s,<>|] # including a backslash in the character class

We also aim to match one or more characters while making sure there is at least one match, which is indicated by the plus sign (+). Consider the example string:

\server\folder

Currently, only "server" is being matched, so we add a backslash to match "\server". Since file paths consist of a backslash followed by a folder name, we need to match this pattern multiple times (but at least once):

(\\[^\\\s",<>|]+)+

To improve readability, a named capturing group ((?<folder>)) is used:

(?<folder>(\\[^\\\s",<>|]+)+)

This will now match strings like \server or

\server\folder\subfolder\subfolder

and save them in a group labeled folder.

Next, let's move on to the URL part. A URL typically starts with http or https, followed by a colon, two forward slashes, and additional content:

https?:\/\/[^\s]+ # additional content must not have whitespaces

Following the same logic, this is stored in a named group called "url":

(?<folder>(\\[^\\\s",<>|]+)+)

Keep in mind that this regex may match invalid URLs (e.g.,

https://www.google.com.256357216423727...

). If this behavior is acceptable, you're good to go. Otherwise, you might want to refer to this question on SO.

Finally, let's combine these elements using an or, store them in another named group ("folderorurl"), and we're finished. Pretty simple, right?

(?<folderorurl>(?<folder>(\\[^\\\s",<>|]+)+)|(?<url>https?:\/\/[^\s]+))

Now, either a folder name or a URL can be found in the folderorurl group while still retaining the individual parts in url or folder. While I'm not familiar with angular.js, this regex should give you a good starting point. You can also check out this regex101 demo for a working example.

Answer 4

Alright, let's start with the regular expression and then move on to the explanation:

(?<folderorurl>(?<folder>(\\[^\\\s",<>|]+)+)|(?<url>https?:\/\/[^\s]+))

The first condition is to match a folder name that should not contain any characters like ", <, >, or |, as well as no whitespaces. This part is denoted as:

[^\s,<>|] # using the caret to negate the character class

In addition, we want to allow for optional subfolders following the main folder name. To achieve this, we need to include a backslash in the character class:

[^\\\s,<>|] # including a backslash in the character class

We also aim to match one or more characters while making sure there is at least one match, which is indicated by the plus sign (+). Consider the example string:

\server\folder

Currently, only "server" is being matched, so we add a backslash to match "\server". Since file paths consist of a backslash followed by a folder name, we need to match this pattern multiple times (but at least once):

(\\[^\\\s",<>|]+)+

To improve readability, a named capturing group ((?<folder>)) is used:

(?<folder>(\\[^\\\s",<>|]+)+)

This will now match strings like \server or

\server\folder\subfolder\subfolder

and save them in a group labeled folder.

Next, let's move on to the URL part. A URL typically starts with http or https, followed by a colon, two forward slashes, and additional content:

https?:\/\/[^\s]+ # additional content must not have whitespaces

Following the same logic, this is stored in a named group called "url":

(?<folder>(\\[^\\\s",<>|]+)+)

Keep in mind that this regex may match invalid URLs (e.g.,

https://www.google.com.256357216423727...

). If this behavior is acceptable, you're good to go. Otherwise, you might want to refer to this question on SO.

Finally, let's combine these elements using an or, store them in another named group ("folderorurl"), and we're finished. Pretty simple, right?

(?<folderorurl>(?<folder>(\\[^\\\s",<>|]+)+)|(?<url>https?:\/\/[^\s]+))

Now, either a folder name or a URL can be found in the folderorurl group while still retaining the individual parts in url or folder. While I'm not familiar with angular.js, this regex should give you a good starting point. You can also check out this regex101 demo for a working example.

Answer 5

Answer №3

For validation, the input must adhere to the specified regex pattern:
^(\\\\[^\\]+\\[^\\]+|https?://[^/]+)
. It should be either in the form of '\\server\share' (optionally followed by one or more "\folder"s) or a valid HTTP(S) URL
The input should not include any invalid characters such as ", <, >, |

To implement the second condition within your regex, ensure to incorporate the invalid characters into the negated character sets. For example, instead of using [^/], you would use [^/"<>|].

Below is a functional sample with a slightly modified regex pattern:

paths = [ '\\server\\share',
          '\\\\server\\share',
          '\\\\server\\share\\folder',
          'http://www.invalid.de',
          'https://example.com',
          '\\\\<server\\share',
          'https://"host.com',
          '\\\\server"\\share',
        ]
for (i in paths)
{
  document.body.appendChild(document.createTextNode(paths[i]+' '+
    /^\\(\\[^\\"<>|]+){2,}$|^https?:\/\/[^/"<>|]+$/.test(paths[i]))))
  document.body.appendChild(document.createElement('br'))
}

Answer 6

For validation, the input must adhere to the specified regex pattern:
^(\\\\[^\\]+\\[^\\]+|https?://[^/]+)
. It should be either in the form of '\\server\share' (optionally followed by one or more "\folder"s) or a valid HTTP(S) URL
The input should not include any invalid characters such as ", <, >, |

To implement the second condition within your regex, ensure to incorporate the invalid characters into the negated character sets. For example, instead of using [^/], you would use [^/"<>|].

Below is a functional sample with a slightly modified regex pattern:

paths = [ '\\server\\share',
          '\\\\server\\share',
          '\\\\server\\share\\folder',
          'http://www.invalid.de',
          'https://example.com',
          '\\\\<server\\share',
          'https://"host.com',
          '\\\\server"\\share',
        ]
for (i in paths)
{
  document.body.appendChild(document.createTextNode(paths[i]+' '+
    /^\\(\\[^\\"<>|]+){2,}$|^https?:\/\/[^/"<>|]+$/.test(paths[i]))))
  document.body.appendChild(document.createElement('br'))
}

Regular expression for ng-pattern to validate file paths

Answer №1

Answer №2

Answer №3

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