regex101: Regex to verify a java method

^start of line

\s*any whitespace character, repeated any number of times

Group 1((public|private|protected)? *(static)? *(void|int|String|boolean|float|double) +[a-zA-Z_](\w)* *[$] *(((int|String|boolean|float|double) +[a-zA-Z_](\w)*))* *( *, *int +[a-zA-Z_](\w)* *| *, *String +[a-zA-Z_](\w)* *| *, *boolean +[a-zA-Z_](\w)* *| *, *float +[a-zA-Z_](\w)* *| *, *double +[a-zA-Z_](\w)* *|$)+\s*[{]\s*|( *public +static +void +main *$ *String *(\[\])? * args *(\[\])? *$\s*[{]\s*))

1st Alternative(public|private|protected)? *(static)? *(void|int|String|boolean|float|double) +[a-zA-Z_](\w)* *[$] *(((int|String|boolean|float|double) +[a-zA-Z_](\w)*))* *( *, *int +[a-zA-Z_](\w)* *| *, *String +[a-zA-Z_](\w)* *| *, *boolean +[a-zA-Z_](\w)* *| *, *float +[a-zA-Z_](\w)* *| *, *double +[a-zA-Z_](\w)* *|$)+\s*[{]\s*

Group 2(public|private|protected)?

?repeats the group contents below at most once:

1st Alternativepublic

publicthe literal text public (case sensitive)

2nd Alternativeprivate

privatethe literal text private (case sensitive)

3rd Alternativeprotected

protectedthe literal text protected (case sensitive)

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

Group 3(static)?

?repeats the group contents below at most once:

staticthe literal text static (case sensitive)

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

1st Alternativevoid

voidthe literal text void (case sensitive)

2nd Alternativeint

intthe literal text int (case sensitive)

3rd AlternativeString

Stringthe literal text String (case sensitive)

4th Alternativeboolean

booleanthe literal text boolean (case sensitive)

5th Alternativefloat

floatthe literal text float (case sensitive)

6th Alternativedouble

doublethe literal text double (case sensitive)

+the literal (32₁₀ / 40₈ / 20₁₆) , repeated at least once

Character Class[a-zA-Z_]

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group 5(\w)*

*repeats the group contents below any number of times:

\wany word character

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

Character Class[\(]

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

Group 6(((int|String|boolean|float|double) +[a-zA-Z_](\w)*))*

*repeats the group contents below any number of times:

Group 7((int|String|boolean|float|double) +[a-zA-Z_](\w)*)

Group 8(int|String|boolean|float|double)

1st Alternativeint

intthe literal text int (case sensitive)

2nd AlternativeString

Stringthe literal text String (case sensitive)

3rd Alternativeboolean

booleanthe literal text boolean (case sensitive)

4th Alternativefloat

floatthe literal text float (case sensitive)

5th Alternativedouble

doublethe literal text double (case sensitive)

+the literal (32₁₀ / 40₈ / 20₁₆) , repeated at least once

Character Class[a-zA-Z_]

Group 9(\w)*

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

\s*any whitespace character, repeated any number of times

Character Class[{]

\s*any whitespace character, repeated any number of times

2nd Alternative( *public +static +void +main *$ *String *(\[\])? * args *(\[\])? *$\s*[{]\s*)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Search reference

Regular Expression

^\s*((public|private|protected)? *(static)? *(void|int|String|boolean|float|double) +[a-zA-Z_](\w)* *[\(] *(((int|String|boolean|float|double) +[a-zA-Z_](\w)*))* *( *, *int +[a-zA-Z_](\w)* *| *, *String +[a-zA-Z_](\w)* *| *, *boolean +[a-zA-Z_](\w)* *| *, *float +[a-zA-Z_](\w)* *| *, *double +[a-zA-Z_](\w)* *|\))+\s*[{]\s*|( *public +static +void +main *\( *String *(\[\])? * args *(\[\])? *\)\s*[{]\s*))

New

public static void salud(String hola,boolean siu) {
void ultimo(int hola){
public void saludos(){
void numeros(String cola, int hola, String si){
public static void main(String[] args){
protected String idnombre (int n){
protected void prueba(String a,int b){
public static void main(String[] args[]){
public static void main(String args[]){
void hola(){}
void hola(){
public void main(String id)
{


public void hola ( int c)
{