diff --git a/regex-filtered/examples/matchindex.rs b/regex-filtered/examples/matchindex.rs
new file mode 100644
index 0000000..e281d86
--- /dev/null
+++ b/regex-filtered/examples/matchindex.rs
@@ -0,0 +1,38 @@
+use clap::Parser;
+use std::io::BufRead;
+
+#[derive(Parser)]
+struct Args {
+    regexes: String,
+    useragents: String,
+}
+
+fn main() {
+    let Args {
+        regexes,
+        useragents,
+    } = Args::parse();
+    let regexes: Vec<_> = std::io::BufReader::new(std::fs::File::open(regexes).unwrap())
+        .lines()
+        .map(|l| regex::Regex::new(&l.unwrap()).unwrap())
+        .collect();
+
+    let mut uas = std::io::BufReader::new(std::fs::File::open(useragents).unwrap());
+    let mut line = String::with_capacity(150);
+    while let Ok(n) = uas.read_line(&mut line) {
+        if n == 0 {
+            break;
+        }
+        let line_ = line.strip_suffix("\n").unwrap_or(&line);
+        let m = regexes
+            .iter()
+            .enumerate()
+            .find(|(_, regex)| regex.is_match(line_));
+        if let Some((i, _)) = m {
+            println!("{i}");
+        } else {
+            println!("-");
+        }
+        line.clear();
+    }
+}
diff --git a/regex-filtered/examples/matchindex2.rs b/regex-filtered/examples/matchindex2.rs
new file mode 100644
index 0000000..fac58be
--- /dev/null
+++ b/regex-filtered/examples/matchindex2.rs
@@ -0,0 +1,40 @@
+use clap::Parser;
+use std::io::BufRead;
+
+#[derive(Parser)]
+struct Args {
+    regexes: String,
+    useragents: String,
+}
+
+fn main() {
+    let Args {
+        regexes,
+        useragents,
+    } = Args::parse();
+    let regexes = regex_filtered::Builder::new()
+        .push_all(
+            std::io::BufReader::new(std::fs::File::open(regexes).unwrap())
+                .lines()
+                .map(Result::unwrap),
+        )
+        .unwrap()
+        .build()
+        .unwrap();
+
+    let mut uas = std::io::BufReader::new(std::fs::File::open(useragents).unwrap());
+    let mut line = String::with_capacity(150);
+    while let Ok(n) = uas.read_line(&mut line) {
+        if n == 0 {
+            break;
+        }
+        let line_ = line.strip_suffix("\n").unwrap_or(&line);
+        let m = regexes.matching(line_).next();
+        if let Some((i, _)) = m {
+            println!("{i}");
+        } else {
+            println!("-");
+        }
+        line.clear();
+    }
+}
diff --git a/scripts/devices b/scripts/devices
index e1fa488..3fd7ee3 100755
--- a/scripts/devices
+++ b/scripts/devices
@@ -31,18 +31,41 @@ r"""Compiles regexes.yaml to just the device regexps, with rewriting:
   Note that this is only done for a lower bound of `0` or `1`, but
   that's the case of all large bounded repetitions in regexes.yaml.
 """
+import argparse
 import string
 import sys
+import urllib.request
 
 from yaml import SafeLoader, load
 
 def main() -> None:
-    with open(sys.argv[1]) as f:
-        regexes = load(f, Loader=SafeLoader)
-    for dev in regexes['device_parsers']:
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        'regexes_yaml',
+        help="path or url to a regexes.yaml file, `-` for stdin",
+    )
+    parser.add_argument(
+        '--section',
+        default='device',
+        choices=['user_agent', 'os', 'device'],
+        help="regex section to convert, defaults to `device`"
+    )
+    args = parser.parse_args()
+
+    regexes = args.regexes_yaml
+    if regexes == '-':
+        regexes = load(sys.stdin, Loader=SafeLoader)
+    elif regexes.startswith('http'):
+        with urllib.request.urlopen(regexes) as f:
+            regexes = load(f, Loader=SafeLoader)
+    else:
+        with open(regexes) as f:
+            regexes = load(f, Loader=SafeLoader)
+
+    for item in regexes[f'{args.section}_parsers']:
         print(
-            f'(?{f})' if (f := dev.get('regex_flag')) else '',
-            rewrite(dev['regex']),
+            f'(?{f})' if (f := item.get('regex_flag')) else '',
+            rewrite(item['regex']),
             sep='',
         )
 
diff --git a/scripts/matchindex b/scripts/matchindex
new file mode 100755
index 0000000..e880404
--- /dev/null
+++ b/scripts/matchindex
@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+
+import argparse
+import re
+
+parser = argparse.ArgumentParser()
+parser.add_argument(
+    'regexes',
+    help="regexes to try on the user agents",
+)
+parser.add_argument(
+    'useragents',
+    type=argparse.FileType(),
+    help="user agents to parse, `-` for stdin",
+)
+args = parser.parse_args()
+
+with open(args.regexes) as r:
+    regexes = [
+        re.compile(pattern.rstrip('\n'))
+        for pattern in r
+    ]
+
+with args.useragents as r:
+    for u in r:
+        u = u.rstrip('\n')
+        for i, p in enumerate(regexes):
+            if p.search(u):
+                print(i)
+                break
+        else:
+            print('-')