## linux – Regex for content / etc / passwd

I have a collection of files from many of my company's systems in a storage directory (/ store /) and I wanted to find all the passwd files and align them into a single file. Intuitively, the command that I created and that I use is the following one:

``````find / store / -name passwd -type f -exec cat {} +> all_passwds.txt
``````

But it also collects the file / etc / passwd which are binary files (I suppose some systems are symbolic links to busybox or something like that). I really just want passwd files based on text.

My next thought is that I might be able to find all the / etc / passwd files and extract the regex matches. It's been a few hours since I tried to create a regular expression that matches the format passwd.

Any help on creating a regexp that will match the / etc / passwd files or how to make sure that the above command only captures passwd text files would be greatly appreciated.

## javascript – Regex pattern for any integer between -20 and 100, including -20 and 100.Numeric 3 characters maximum and no decimal

Can any one please confirm if the regex below will work for this condition

``````Any integer between -20 and 100, including -20 and 100.Numeric 3 characters max. And without decimals - E.g - -20, -18, etc.

^ ((\ - ([1-9]| 1[0-9]| 20)) | ([0-9]|[1-8][0-9]| 9[0-9]| 100)) \$
``````

## python – regex version of strip () – Ch. 7 Automate the boring stuff

Here is a practical exercise – Regex version of `gang()` $$–$$

Write a function that takes a string and does the same thing as the
`gang()` chain method. If no other argument has gone beyond the
string to strip, the spacing characters will be removed from the
beginning and end of the chain. Otherwise, the specified characters
in the second argument of the function will be removed from the
chain.

I wrote the following code. Is there a better way to write it? All comments are highly appreciated.

``````import re

def regex_strip (s, chars = None):

if characters == none:
strip_left = re.compile (r & # 39; ^  s *)
strip_right = re.compile (r  s * \$ & # 39;)

s = re.sub (strip_left, "", s)
s = re.sub (strip_right, "", s)
other:
strip_left = re.compile (r & # 39; ^[' + re.escape(chars) + r']* & # 39;)
strip_right = re.compile (r & # 39;[' + re.escape(chars) + r']* \$ & # 39;)
s = re.sub (strip_left, "", s)
s = re.sub (strip_right, "", s)
results
``````

Here is an example of an exit –

``````s = & # 39; * alphabetatheta * 4453 + - & # 39;
print (regex_strip (s, & # 39 ;. + - *))

>>> alphabetatheta * 4453
``````

## java – Problem with regex in Android Studio – No data extraction

I'm trying to get a PID through regular expressions (regex), but at the moment of using find () he is not able to find it, the line he analyzes follows a format like this:

``````> E / AndroidRuntime (14700): Process: com.example.log_v_02, PID: 14700
> E / AndroidRuntime (4700): Process: com.example.log_v_02, PID: 14700
``````

However, I can not extract the numbers in parentheses, which in this case would be 14700 and 4700 (sometimes, when there is a space after the first parenthesis, my code is as follows:

``````                Pattern saca_pid = Pattern.compile ("(\\ s * (\\ d +)):");
StringBuilder log = new StringBuilder ();
Character string = "";
while (true) {
try {
if (! ((line = bufferedReader.readLine ())! = null)) break;
} catch (IOException e) {
e.printStackTrace ();
}

Matcher find_pid = saca_pid.matcher (line);
if (encontra_pid.find ()) {
String pid = find_pid.group (1);
int num_pid = Integer.parseInt (pid);
}

}
``````

I would greatly appreciate your help, thank you.

## schema.org – regex interpretation for an additional json properties

Syntax highlighting begins to indicate your error. You are missing a quote after `chain` for your `First name` property:

``````firstname ": {" type ":" string},
``````

You do the same thing after "name":

``````"name": {"type": "string"
``````

And your regex completely misses a starting quote:

``````"pattern": ^ (string | (a | b (\ \<[a-z]|(-?d+)\)\$,[09]\>))) "
``````

You also have an invalid regex, an extra parenthesis, and an extra forward slash. ` d +`:

``````^ (string | (a | b (\ \<[a-z]|(-?\d+)\)\$,[09]\>))
``````

And finally also have an extra closure `}`

``````{
"type": "object",
"Properties": {
"First name": {
"type": "string"
}
"Last name": {
"type": "string"
}
}
"type": ["integer", "number", "null",
"boolean", "object", "array"
],
"pattern": "^ (string | (a | b (\ \<[a-z]|(-?\d+)\)\$,[09]\>)) "
}
}
``````

Much of this, with regex being the only exception, was easily solved by basic troubleshooting. The first thing to do is to format your code, in this case your JSON string. It is easier to read and then to spot errors. Take your time and review your work. You will go faster but moving more slowly.

## regex – match date of sed pattern

I have trouble understanding how to use pattern matching with the help of sed.

In a large file, I want to replace the next date format, from dd.mm.yyyy to dd / mm / yyyy, to replace the dots with slashes. The file contains multiple occurrences of dates in the specified format. However, he must not change complete stops at the end of sentences, etc.

sed & # 39; s /./// g & # 39; s does the job, but changes every (.). I therefore need a way to make a pattern match.

Any help would be appreciated.

Thank you

## regex – php preg_match with multiple patterns

I'm trying to combine two separate preg_match templates with, | ,.

``````/ blog  / page  /[0-9]+  /? \$ / with / tag / / skip in / blog / page / and / tag /
/page/[0-9]+  /? \$ / with /[0-9]+  /? \$ / ex. / page / 2 / and only / 2 /
/(page/[0-9]+  /?) \$ / with / ([0-9]+  /?) \$ /

function redirect_pagination () {
if (! preg_match (& # 39; / blog  / page  /[0-9]+  /? \$ /, |, / tag  / & # 39 ;, \$ _SERVER['REQUEST_URI'])) {
if (preg_match (& # 39; / page /[0-9]+  /? \$ /, |, /[0-9]+  /? \$ / \$, \$ _SERVER['REQUEST_URI'])) {
\$ new_url = preg_replace (& # 39; / (page /[0-9]+  /?) \$ /, |, / ([0-9]+  /?) \$ / & # 39;, & # 39; & # 39; \$ _SERVER['REQUEST_URI'])
wp_redirect (\$ new_url, 301);
exit;
}
}
}
add_action (& # 39; init & # 39; redirect_pagination & # 39 ;, 1);
``````

## regex – How to create a regular expression that accepts special characters

I have the following regular expression:

``````^ (? = (?:. *  d) {1}) (? = (?:. *[A-Z]) {1}) (? = (?:. *[a-z]) {1})  S {8,16} \$
``````

Try to complete this example but I must add to this regular expression that validates special characters, for example: `(@ \$? ¡-_)`.

The regular expression must validate the following:

length 8 characters
validate at least 1 digit
validate at least 1 capital letter
validate the lowercase letters and
Validate at least 1 special character

## Java RegEx – Find a previously saved match

The title may not be clear enough, but my description should make it clear. My question is about RegEx in Java.

``````String txt = text.getText (). ToString ();
Pattern p = Pattern.compile ("(<)([a-z]{0,}[0-9]{0,}[a-z]{0,})(>) (. *) () ");
Matcher m = p.matcher (txt);
if (m.find ())
res.setText (m.group (0));
``````
``````txt = "beforeboldafter"
``````

the `\$ 2` in the expression is dedicated to the second match "p" on the `SMS`. It means that I'm trying to match. "`...`But I can not do it.

If I create my regex as `"(<)([a-z]{0,}[0-9]{0,}[a-z]{0,})(>) (. *) () "` it will match

``` ```

`beforebold`. But I want it to match the first "p" match of the last one.

## algorithms – NFA Regex Construction: Why use Glushkov on Thompson? Advantages disadvantages

Under what circumstances should we prefer Glushkov's algorithm or Thompson's construction for the construction of DNA with regular expression?

I understand the difference between them and can follow the argument of each approach.

I understand that the result is an NFA in each case but with a lack of $$epsilon$$-transitions in Glushkov's approach, and that this probably results in a minor[?] advantage of the complexity of implementation at the time of the match and reduction of the total number of states for a given expression?

Are these the main criteria for recommending Glushkov?

It seems that Glushkov's construction process may be more complex than Thompson's. Is that the case? Does this plead in favor of Thompson for projects where this is a factor?

Are there other important factors affecting the choice of implementation that I am not aware of?