Java Utililty Methods Wildcard to Regex

List of utility methods to do Wildcard to Regex

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Description

The list of methods to do Wildcard to Regex are organized into topic(s).

Method

Stringwildcard2Regex(final String wildcard)
wildcard Regex 
StringBuffer s = new StringBuffer((int) (wildcard.length() * 1.3));
String w = wildcard;
for (int i = 0, is = w.length(); i < is; i++) {
    char c = w.charAt(i);
    switch (c) {
    case '*':
        s.append(".*");
        break;
...
Stringwildcard2regexp(String wildcard)
Compile wildcard to regexp 
StringBuffer sb = new StringBuffer("^");
for (int i = 0; i < wildcard.length(); i++) {
    char c = wildcard.charAt(i);
    switch (c) {
    case '.':
        sb.append("\\.");
        break;
    case '*':
...
StringwildcardAsRegex(String patternWithWildcards)
converts a string containing wildcards (* and ?) into a valid regex 
if (patternWithWildcards == null) {
    throw new IllegalArgumentException("patternWithWildcards must not be null");
return "\\Q" + patternWithWildcards.replace("?", "\\E.\\Q").replace("*", "\\E.*\\Q") + "\\E";
StringwildcardAsRegex(String wildcard)
convert a wild card containing * and ? 
StringBuilder sb = new StringBuilder();
for (int i = 0; i < wildcard.length(); i++) {
    final char c = wildcard.charAt(i);
    switch (c) {
    case '*':
        sb.append(".*?");
        break;
    case '?':
...
StringwildcardToJavaRegex(String expr)
wildcard To Java Regex 
if (expr == null) {
    throw new IllegalArgumentException("expr is null");
String regex = expr.replaceAll("([(){}\\[\\].+^$])", "\\\\$1"); 
regex = regex.replaceAll("\\*", ".*"); 
regex = regex.replaceAll("\\?", "."); 
return regex;
StringwildcardToJavaRegexp(String expr)
wildcard To Java Regexp 
if (expr == null) {
    throw new IllegalArgumentException("expr is null");
String regex = expr.replaceAll("([(){}\\[\\].+^$])", "\\\\$1"); 
regex = regex.replaceAll("\\*", ".*"); 
regex = regex.replaceAll("\\?", "."); 
return regex;
StringwildcardToRegex(CharSequence s)
wildcard To Regex 
StringBuilder sb = new StringBuilder();
int len = s.length();
for (int i = 0; i < len; i++) {
    char ch = s.charAt(i);
    switch (ch) {
    case '*':
        sb.append(".*");
        break;
...
StringwildcardToRegex(final String input)
wildcard To Regex 
StringBuilder sb = new StringBuilder(input.length() + 10);
sb.append('^');
for (int i = 0; i < input.length(); ++i) {
    char c = input.charAt(i);
    if (c == '*') {
        sb.append(".*");
    } else if (c == '?') {
        sb.append('.');
...
StringwildcardToRegex(final String pattern)
wildcard To Regex 
if (pattern == null) {
    return null;
return pattern.replace("*", ".*").replace("?", ".");
StringwildcardToRegex(String toSearch, boolean supportSQLWildcard)
Convert a string that is expected to have standard "filename wildcards" to a matching regular expression. 
StringBuilder s = new StringBuilder(toSearch.length() + 5);
s.append('^');
for (int i = 0, is = toSearch.length(); i < is; i++) {
    char c = toSearch.charAt(i);
    if (c == '*' || (c == '%' && supportSQLWildcard)) 
        s.append(".*");
    } else if (c == '?') {
...