Regex that Will Match a Java Method Declaration

Question

I need a Regex that will match a java method declaration. I have come up with one that will match a method declaration, but it requires the opening bracket of the method to

Answer 1

After looking through the other answers, here is what I came up with:

#permission
   ^[ \t]*(?:(?:public|protected|private)\s+)?
#keywords
   (?:(static|final|native|synchronized|abstract|threadsafe|transient|{#insert zJRgx123GenericsNotInGroup})\s+){0,}
#return type
   #If return type is "return" then it's actually a 'return funcName();' line. Ignore.
   (?!return)
   \b([\w.]+)\b(?:|{#insert zJRgx123GenericsNotInGroup})((?:\[\]){0,})\s+
#function name
   \b\w+\b\s*
#parameters
   \(
      #one
         \s*(?:\b([\w.]+)\b(?:|{#insert zJRgx123GenericsNotInGroup})((?:\[\]){0,})(\.\.\.)?\s+(\w+)\b(?![>\[])
      #two and up
         \(\s*(?:,\s+\b([\w.]+)\b(?:|{#insert zJRgx123GenericsNotInGroup})((?:\[\]){0,})(\.\.\.)?\s+(\w+)\b(?![>\[])\s*){0,})?\s*
   \)
#post parameters
   (?:\s*throws [\w.]+(\s*,\s*[\w.]+))?
#close-curly (concrete) or semi-colon (abstract)
   \s*(?:\{|;)[ \t]*$

---

Where {#insert zJRgx123GenericsNotInGroup} equals

`(?:<[?\w\[\] ,.&]+>)|(?:<[^<]*<[?\w\[\] ,.&]+>[^>]*>)|(?:<[^<]*<[^<]*<[?\w\[\] ,.&]+>[^>]*>[^>]*>)`

Limitations:

• ANY parameter can have an ellipsis: "..." (Java allows only last)
• Three levels of nested generics at most: (<...<...<...>...>...> okay, <...<...<...<...>...>...>...> bad). The syntax inside generics can be very bogus, and still seem okay to this regex.
• Requires no spaces between types and their (optional) opening generics '<'
• Recognizes inner classes, but doesn't prevent two dots next to each other, such as Class....InnerClass

Below is the raw PhraseExpress code (auto-text and description on line 1, body on line 2). Call {#insert zJRgxJavaFuncSigThrSemicOrOpnCrly}, and you get this:

^[ \t]*(?:(?:public|protected|private)\s+)?(?:(static|final|native|synchronized|abstract|threadsafe|transient|(?:<[?\w\[\] ,&]+>)|(?:<[^<]*<[?\w\[\] ,&]+>[^>]*>)|(?:<[^<]*<[^<]*<[?\w\[\] ,&]+>[^>]*>[^>]*>))\s+){0,}(?!return)\b([\w.]+)\b(?:|(?:<[?\w\[\] ,&]+>)|(?:<[^<]*<[?\w\[\] ,&]+>[^>]*>)|(?:<[^<]*<[^<]*<[?\w\[\] ,&]+>[^>]*>[^>]*>))((?:\[\]){0,})\s+\b\w+\b\s*\(\s*(?:\b([\w.]+)\b(?:|(?:<[?\w\[\] ,&]+>)|(?:<[^<]*<[?\w\[\] ,&]+>[^>]*>)|(?:<[^<]*<[^<]*<[?\w\[\] ,&]+>[^>]*>[^>]*>))((?:\[\]){0,})(\.\.\.)?\s+(\w+)\b(?![>\[])\s*(?:,\s+\b([\w.]+)\b(?:|(?:<[?\w\[\] ,&]+>)|(?:<[^<]*<[?\w\[\] ,&]+>[^>]*>)|(?:<[^<]*<[^<]*<[?\w\[\] ,&]+>[^>]*>[^>]*>))((?:\[\]){0,})(\.\.\.)?\s+(\w+)\b(?![>\[])\s*){0,})?\s*\)(?:\s*throws [\w.]+(\s*,\s*[\w.]+))?\s*(?:\{|;)[ \t]*$

---

Raw code:

zJRgx123GenericsNotInGroup -- To precede return-type    (?:<[?\w\[\] ,.&]+>)|(?:<[^<]*<[?\w\[\] ,.&]+>[^>]*>)|(?:<[^<]*<[^<]*<[?\w\[\] ,.&]+>[^>]*>[^>]*>)  zJRgx123GenericsNotInGroup
zJRgx0OrMoreParams  \s*(?:{#insert zJRgxParamTypeName}\s*(?:,\s+{#insert zJRgxParamTypeName}\s*){0,})?\s*   zJRgx0OrMoreParams
zJRgxJavaFuncNmThrClsPrn_M_fnm -- Needs zvFOBJ_NAME (?<=\s)\b{#insert zvFOBJ_NAME}{#insert zzJRgxPostFuncNmThrClsPrn}   zJRgxJavaFuncNmThrClsPrn_M_fnm
zJRgxJavaFuncSigThrSemicOrOpnCrly -(**)-    {#insert zzJRgxJavaFuncSigPreFuncName}\w+{#insert zzJRgxJavaFuncSigPostFuncName}    zJRgxJavaFuncSigThrSemicOrOpnCrly
zJRgxJavaFuncSigThrSemicOrOpnCrly_M_fnm -- Needs zvFOBJ_NAME    {#insert zzJRgxJavaFuncSigPreFuncName}{#insert zvFOBJ_NAME}{#insert zzJRgxJavaFuncSigPostFuncName}  zJRgxJavaFuncSigThrSemicOrOpnCrly_M_fnm
zJRgxOptKeywordsBtwScopeAndRetType  (?:(static|final|native|synchronized|abstract|threadsafe|transient|{#insert zJRgx123GenericsNotInGroup})\s+){0,}    zJRgxOptKeywordsBtwScopeAndRetType
zJRgxOptionalPubProtPriv    (?:(?:public|protected|private)\s+)?    zJRgxOptionalPubProtPriv
zJRgxParamTypeName -(**)- Ends w/ '\b(?![>\[])' to NOT find  or ...[]>  (*Original: zJRgxParamTypeName, Needed by: zJRgxParamTypeName[4FQPTV,ForDel[NmsOnly,Types]]*){#insert zJRgxTypeW0123GenericsArry}(\.\.\.)?\s+(\w+)\b(?![>\[])   zJRgxParamTypeName
zJRgxTypeW0123GenericsArry -- Grp1=Type, Grp2='[]', if any  \b([\w.]+)\b(?:|{#insert zJRgx123GenericsNotInGroup})((?:\[\]){0,}) zJRgxTypeW0123GenericsArry
zvTTL_PRMS_stL1c    {#insert zCutL1c}{#SETPHRASE -description zvTTL_PRMS -content {#INSERTCLIPBOARD} -autotext zvTTL_PRMS -folder ctvv_folder}  zvTTL_PRMS_stL1c
zvTTL_PRMS_stL1cSvRstrCB    {#insert zvCB_CONTENTS_stCB}{#insert zvTTL_PRMS_stL1c}{#insert zSetCBToCB_CONTENTS} zvTTL_PRMS_stL1cSvRstrCB
zvTTL_PRMS_stPrompt {#SETPHRASE -description zvTTL_PRMS -content {#INPUT -head How many parameters? -single} -autotext zvTTL_PRMS -folder ctvv_folder}  zvTTL_PRMS_stPrompt
zzJRgxJavaFuncNmThrClsPrn_M_fnmTtlp -- Needs zvFOBJ_NAME, zvTTL_PRMS    (?<=[ \t])\b{#insert zvFOBJ_NAME}\b\s*\(\s*{#insert {#COND -if {#insert zvTTL_PRMS} = 0 -then z1slp -else zzParamsGT0_M_ttlp}}\)    zzJRgxJavaFuncNmThrClsPrn_M_fnmTtlp
zzJRgxJavaFuncSigPostFuncName   {#insert zzJRgxPostFuncNmThrClsPrn}(?:\s*throws \b(?:[\w.]+)\b(\s*,\s*\b(?:[\w.]+)\b))?\s*(?:\{|;)[ \t]*$   zzJRgxJavaFuncSigPostFuncName
zzJRgxJavaFuncSigPreFuncName    (*If a type has generics, there may be no spaces between it and the first open '<', also requires generics with three nestings at the most (<...<...<...>...>...> okay, <...<...<...<...>...>...>...> not)*)^[ \t]*{#insert zJRgxOptionalPubProtPriv}{#insert zJRgxOptKeywordsBtwScopeAndRetType}(*To prevent 'return funcName();' from being recognized:*)(?!return){#insert zJRgxTypeW0123GenericsArry}\s+\b  zzJRgxJavaFuncSigPreFuncName
zzJRgxPostFuncNmThrClsPrn   \b\s*\({#insert zJRgx0OrMoreParams}\)   zzJRgxPostFuncNmThrClsPrn
zzParamsGT0_M_ttlp -- Needs zvTTL_PRMS  {#insert zJRgxParamTypeName}\s*{#insert {#COND -if {#insert zvTTL_PRMS} = 1 -then z1slp -else zzParamsGT1_M_ttlp}}  zzParamsGT0_M_ttlp
zzParamsGT1_M_ttlp  {#LOOP ,\s+{#insert zJRgxParamTypeName}\s* -count {#CALC {#insert zvTTL_PRMS} - 1 -round 0 -thousands none}}    zzParamsGT1_M_ttlp