diff --git a/src/atom/parsers.rs b/src/atom/parsers.rs
index 37e18a7..d3eaf7a 100644
--- a/src/atom/parsers.rs
+++ b/src/atom/parsers.rs
@@ -1,6 +1,6 @@
 use core::option::Option::None;
 
-use mon::{Parser, ParserIter, r#if, numeric1, one_of, tag};
+use mon::{Parser, ParserIter, alphanumeric, r#if, numeric1, one_of, tag};
 
 use crate::{
     Parseable,
@@ -115,10 +115,8 @@ impl<'a> Parseable<'a, &'a str> for Category {
     type Parser = impl Parser<&'a str, Output = Self>;
 
     fn parser() -> Self::Parser {
-        let start = r#if(|c: &char| c.is_ascii_alphanumeric() || *c == '_');
-        let rest = r#if(|c: &char| c.is_ascii_alphanumeric() || "+_.-".contains(*c))
-            .repeated()
-            .many();
+        let start = alphanumeric().or(one_of("_".chars()));
+        let rest = alphanumeric().or(one_of("+_.-".chars())).repeated().many();
 
         start
             .and(rest)
@@ -131,13 +129,15 @@ impl<'a> Parseable<'a, &'a str> for Name {
     type Parser = impl Parser<&'a str, Output = Self>;
 
     fn parser() -> Self::Parser {
-        let start = r#if(|c: &char| c.is_ascii_alphanumeric() || *c == '_');
-        let rest = r#if(|c: &char| c.is_ascii_alphanumeric() || "_+".contains(*c))
-            .or(
-                one_of("-".chars()).and_not(Version::parser().preceded_by(tag("-")).followed_by(
-                    r#if(|c: &char| c.is_ascii_alphanumeric() || "_+-".contains(*c)).not(),
-                )),
-            )
+        let start = alphanumeric().or(one_of("_".chars()));
+
+        let rest = alphanumeric()
+            .or(one_of("_+".chars()))
+            .or(one_of("-".chars()).and_not(
+                Version::parser()
+                    .preceded_by(tag("-"))
+                    .followed_by(alphanumeric().or(one_of("_+-".chars())).not()),
+            ))
             .repeated()
             .many();
 
@@ -162,10 +162,8 @@ impl<'a> Parseable<'a, &'a str> for SlotName {
     type Parser = impl Parser<&'a str, Output = Self>;
 
     fn parser() -> Self::Parser {
-        let start = r#if(|c: &char| c.is_ascii_alphanumeric() || *c == '_');
-        let rest = r#if(|c: &char| c.is_ascii_alphanumeric() || "+_.-".contains(*c))
-            .repeated()
-            .many();
+        let start = alphanumeric().or(one_of("_".chars()));
+        let rest = alphanumeric().or(one_of("+_.-".chars())).repeated().many();
 
         start
             .and(rest)
diff --git a/src/ebuild/parsers.rs b/src/ebuild/parsers.rs
index f685df3..8ab2978 100644
--- a/src/ebuild/parsers.rs
+++ b/src/ebuild/parsers.rs
@@ -1,6 +1,6 @@
 use std::path::PathBuf;
 
-use mon::{Parser, ParserIter, alpha1, r#if, tag, whitespace1};
+use mon::{Parser, ParserIter, alpha1, alphanumeric, r#if, one_of, tag, whitespace1};
 
 use crate::{
     Parseable,
@@ -48,6 +48,7 @@ impl<'a> Parseable<'a, &'a str> for SrcUri {
                 .recognize()
                 .map(|output: &str| PathBuf::from(output))
         };
+
         let uri = UriPrefix::parser()
             .opt()
             .and(Uri::parser())
@@ -66,10 +67,8 @@ impl<'a> Parseable<'a, &'a str> for License {
     type Parser = impl Parser<&'a str, Output = Self>;
 
     fn parser() -> Self::Parser {
-        let start = r#if(|c: &char| c.is_ascii_alphanumeric() || "_".contains(*c));
-        let rest = r#if(|c: &char| c.is_ascii_alphanumeric() || "+_.-".contains(*c))
-            .repeated()
-            .many();
+        let start = alphanumeric().or(one_of("_".chars()));
+        let rest = alphanumeric().or(one_of("+_.-".chars())).repeated().many();
 
         start
             .and(rest)
@@ -82,10 +81,8 @@ impl<'a> Parseable<'a, &'a str> for Eapi {
     type Parser = impl Parser<&'a str, Output = Self>;
 
     fn parser() -> Self::Parser {
-        let start = r#if(|c: &char| c.is_ascii_alphanumeric() || "_".contains(*c));
-        let rest = r#if(|c: &char| c.is_ascii_alphanumeric() || "+_.-".contains(*c))
-            .repeated()
-            .many();
+        let start = alphanumeric().or(one_of("_".chars()));
+        let rest = alphanumeric().or(one_of("+_.-".chars())).repeated().many();
 
         start
             .and(rest)
diff --git a/src/useflag/parsers.rs b/src/useflag/parsers.rs
index d9aaf21..fc371a6 100644
--- a/src/useflag/parsers.rs
+++ b/src/useflag/parsers.rs
@@ -1,4 +1,4 @@
-use mon::{Parser, ParserIter, r#if, tag};
+use mon::{Parser, ParserIter, alphanumeric, one_of, tag};
 
 use crate::{
     Parseable,
@@ -9,10 +9,8 @@ impl<'a> Parseable<'a, &'a str> for UseFlag {
     type Parser = impl Parser<&'a str, Output = Self>;
 
     fn parser() -> Self::Parser {
-        let start = r#if(|c: &char| c.is_ascii_alphanumeric());
-        let rest = r#if(|c: &char| c.is_ascii_alphanumeric() || "+_@-".contains(*c))
-            .repeated()
-            .many();
+        let start = alphanumeric();
+        let rest = alphanumeric().or(one_of("+_@-".chars())).repeated().many();
 
         start
             .and(rest)