Saya menggunakan RegexBuddy saat bekerja dengan ekspresi reguler. Dari perpustakaannya saya menyalin ekspresi reguler untuk mencocokkan URL. Saya berhasil menguji dalam RegexBuddy. Namun, ketika saya menyalinnya sebagai String
flavor Java dan menempelkannya ke kode Java, itu tidak berfungsi. Cetakan kelas berikut false
:
public class RegexFoo {
public static void main(String[] args) {
String regex = "\\b(https?|ftp|file)://[-A-Z0-9+&@#/%?=~_|!:,.;]*[-A-Z0-9+&@#/%=~_|]";
String text = "http://google.com";
System.out.println(IsMatch(text,regex));
}
private static boolean IsMatch(String s, String pattern) {
try {
Pattern patt = Pattern.compile(pattern);
Matcher matcher = patt.matcher(s);
return matcher.matches();
} catch (RuntimeException e) {
return false;
}
}
}
Adakah yang tahu apa yang saya lakukan salah?
java
regex
regexbuddy
Sergio del Amo
sumber
sumber
Jawaban:
Coba string regex berikut sebagai gantinya. Tes Anda mungkin dilakukan dengan cara yang peka huruf besar / kecil. Saya telah menambahkan huruf kecil alfa serta placeholder awal string yang tepat.
String regex = "^(https?|ftp|file)://[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]";
Ini juga berfungsi:
String regex = "\\b(https?|ftp|file)://[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]";
catatan:
String regex = "<\\b(https?|ftp|file)://[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]>"; // matches <http://google.com> String regex = "<^(https?|ftp|file)://[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]>"; // does not match <http://google.com>
sumber
Cara terbaik untuk melakukannya sekarang adalah:
EDIT: Kode
Patterns
dari https://github.com/android/platform_frameworks_base/blob/master/core/java/android/util/Patterns.java :/* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package android.util; import java.util.regex.Matcher; import java.util.regex.Pattern; /** * Commonly used regular expression patterns. */ public class Patterns { /** * Regular expression to match all IANA top-level domains. * List accurate as of 2011/07/18. List taken from: * http://data.iana.org/TLD/tlds-alpha-by-domain.txt * This pattern is auto-generated by frameworks/ex/common/tools/make-iana-tld-pattern.py * * @deprecated Due to the recent profileration of gTLDs, this API is * expected to become out-of-date very quickly. Therefore it is now * deprecated. */ @Deprecated public static final String TOP_LEVEL_DOMAIN_STR = "((aero|arpa|asia|a[cdefgilmnoqrstuwxz])" + "|(biz|b[abdefghijmnorstvwyz])" + "|(cat|com|coop|c[acdfghiklmnoruvxyz])" + "|d[ejkmoz]" + "|(edu|e[cegrstu])" + "|f[ijkmor]" + "|(gov|g[abdefghilmnpqrstuwy])" + "|h[kmnrtu]" + "|(info|int|i[delmnoqrst])" + "|(jobs|j[emop])" + "|k[eghimnprwyz]" + "|l[abcikrstuvy]" + "|(mil|mobi|museum|m[acdeghklmnopqrstuvwxyz])" + "|(name|net|n[acefgilopruz])" + "|(org|om)" + "|(pro|p[aefghklmnrstwy])" + "|qa" + "|r[eosuw]" + "|s[abcdeghijklmnortuvyz]" + "|(tel|travel|t[cdfghjklmnoprtvwz])" + "|u[agksyz]" + "|v[aceginu]" + "|w[fs]" + "|(\u03b4\u03bf\u03ba\u03b9\u03bc\u03ae|\u0438\u0441\u043f\u044b\u0442\u0430\u043d\u0438\u0435|\u0440\u0444|\u0441\u0440\u0431|\u05d8\u05e2\u05e1\u05d8|\u0622\u0632\u0645\u0627\u06cc\u0634\u06cc|\u0625\u062e\u062a\u0628\u0627\u0631|\u0627\u0644\u0627\u0631\u062f\u0646|\u0627\u0644\u062c\u0632\u0627\u0626\u0631|\u0627\u0644\u0633\u0639\u0648\u062f\u064a\u0629|\u0627\u0644\u0645\u063a\u0631\u0628|\u0627\u0645\u0627\u0631\u0627\u062a|\u0628\u06be\u0627\u0631\u062a|\u062a\u0648\u0646\u0633|\u0633\u0648\u0631\u064a\u0629|\u0641\u0644\u0633\u0637\u064a\u0646|\u0642\u0637\u0631|\u0645\u0635\u0631|\u092a\u0930\u0940\u0915\u094d\u0937\u093e|\u092d\u093e\u0930\u0924|\u09ad\u09be\u09b0\u09a4|\u0a2d\u0a3e\u0a30\u0a24|\u0aad\u0abe\u0ab0\u0aa4|\u0b87\u0ba8\u0bcd\u0ba4\u0bbf\u0baf\u0bbe|\u0b87\u0bb2\u0b99\u0bcd\u0b95\u0bc8|\u0b9a\u0bbf\u0b99\u0bcd\u0b95\u0baa\u0bcd\u0baa\u0bc2\u0bb0\u0bcd|\u0baa\u0bb0\u0bbf\u0b9f\u0bcd\u0b9a\u0bc8|\u0c2d\u0c3e\u0c30\u0c24\u0c4d|\u0dbd\u0d82\u0d9a\u0dcf|\u0e44\u0e17\u0e22|\u30c6\u30b9\u30c8|\u4e2d\u56fd|\u4e2d\u570b|\u53f0\u6e7e|\u53f0\u7063|\u65b0\u52a0\u5761|\u6d4b\u8bd5|\u6e2c\u8a66|\u9999\u6e2f|\ud14c\uc2a4\ud2b8|\ud55c\uad6d|xn\\-\\-0zwm56d|xn\\-\\-11b5bs3a9aj6g|xn\\-\\-3e0b707e|xn\\-\\-45brj9c|xn\\-\\-80akhbyknj4f|xn\\-\\-90a3ac|xn\\-\\-9t4b11yi5a|xn\\-\\-clchc0ea0b2g2a9gcd|xn\\-\\-deba0ad|xn\\-\\-fiqs8s|xn\\-\\-fiqz9s|xn\\-\\-fpcrj9c3d|xn\\-\\-fzc2c9e2c|xn\\-\\-g6w251d|xn\\-\\-gecrj9c|xn\\-\\-h2brj9c|xn\\-\\-hgbk6aj7f53bba|xn\\-\\-hlcj6aya9esc7a|xn\\-\\-j6w193g|xn\\-\\-jxalpdlp|xn\\-\\-kgbechtv|xn\\-\\-kprw13d|xn\\-\\-kpry57d|xn\\-\\-lgbbat1ad8j|xn\\-\\-mgbaam7a8h|xn\\-\\-mgbayh7gpa|xn\\-\\-mgbbh1a71e|xn\\-\\-mgbc0a9azcg|xn\\-\\-mgberp4a5d4ar|xn\\-\\-o3cw4h|xn\\-\\-ogbpf8fl|xn\\-\\-p1ai|xn\\-\\-pgbs0dh|xn\\-\\-s9brj9c|xn\\-\\-wgbh1c|xn\\-\\-wgbl6a|xn\\-\\-xkc2al3hye2a|xn\\-\\-xkc2dl3a5ee0h|xn\\-\\-yfro4i67o|xn\\-\\-ygbi2ammx|xn\\-\\-zckzah|xxx)" + "|y[et]" + "|z[amw])"; /** * Regular expression pattern to match all IANA top-level domains. * @deprecated This API is deprecated. See {@link #TOP_LEVEL_DOMAIN_STR}. */ @Deprecated public static final Pattern TOP_LEVEL_DOMAIN = Pattern.compile(TOP_LEVEL_DOMAIN_STR); /** * Regular expression to match all IANA top-level domains for WEB_URL. * List accurate as of 2011/07/18. List taken from: * http://data.iana.org/TLD/tlds-alpha-by-domain.txt * This pattern is auto-generated by frameworks/ex/common/tools/make-iana-tld-pattern.py * * @deprecated This API is deprecated. See {@link #TOP_LEVEL_DOMAIN_STR}. */ @Deprecated public static final String TOP_LEVEL_DOMAIN_STR_FOR_WEB_URL = "(?:" + "(?:aero|arpa|asia|a[cdefgilmnoqrstuwxz])" + "|(?:biz|b[abdefghijmnorstvwyz])" + "|(?:cat|com|coop|c[acdfghiklmnoruvxyz])" + "|d[ejkmoz]" + "|(?:edu|e[cegrstu])" + "|f[ijkmor]" + "|(?:gov|g[abdefghilmnpqrstuwy])" + "|h[kmnrtu]" + "|(?:info|int|i[delmnoqrst])" + "|(?:jobs|j[emop])" + "|k[eghimnprwyz]" + "|l[abcikrstuvy]" + "|(?:mil|mobi|museum|m[acdeghklmnopqrstuvwxyz])" + "|(?:name|net|n[acefgilopruz])" + "|(?:org|om)" + "|(?:pro|p[aefghklmnrstwy])" + "|qa" + "|r[eosuw]" + "|s[abcdeghijklmnortuvyz]" + "|(?:tel|travel|t[cdfghjklmnoprtvwz])" + "|u[agksyz]" + "|v[aceginu]" + "|w[fs]" + "|(?:\u03b4\u03bf\u03ba\u03b9\u03bc\u03ae|\u0438\u0441\u043f\u044b\u0442\u0430\u043d\u0438\u0435|\u0440\u0444|\u0441\u0440\u0431|\u05d8\u05e2\u05e1\u05d8|\u0622\u0632\u0645\u0627\u06cc\u0634\u06cc|\u0625\u062e\u062a\u0628\u0627\u0631|\u0627\u0644\u0627\u0631\u062f\u0646|\u0627\u0644\u062c\u0632\u0627\u0626\u0631|\u0627\u0644\u0633\u0639\u0648\u062f\u064a\u0629|\u0627\u0644\u0645\u063a\u0631\u0628|\u0627\u0645\u0627\u0631\u0627\u062a|\u0628\u06be\u0627\u0631\u062a|\u062a\u0648\u0646\u0633|\u0633\u0648\u0631\u064a\u0629|\u0641\u0644\u0633\u0637\u064a\u0646|\u0642\u0637\u0631|\u0645\u0635\u0631|\u092a\u0930\u0940\u0915\u094d\u0937\u093e|\u092d\u093e\u0930\u0924|\u09ad\u09be\u09b0\u09a4|\u0a2d\u0a3e\u0a30\u0a24|\u0aad\u0abe\u0ab0\u0aa4|\u0b87\u0ba8\u0bcd\u0ba4\u0bbf\u0baf\u0bbe|\u0b87\u0bb2\u0b99\u0bcd\u0b95\u0bc8|\u0b9a\u0bbf\u0b99\u0bcd\u0b95\u0baa\u0bcd\u0baa\u0bc2\u0bb0\u0bcd|\u0baa\u0bb0\u0bbf\u0b9f\u0bcd\u0b9a\u0bc8|\u0c2d\u0c3e\u0c30\u0c24\u0c4d|\u0dbd\u0d82\u0d9a\u0dcf|\u0e44\u0e17\u0e22|\u30c6\u30b9\u30c8|\u4e2d\u56fd|\u4e2d\u570b|\u53f0\u6e7e|\u53f0\u7063|\u65b0\u52a0\u5761|\u6d4b\u8bd5|\u6e2c\u8a66|\u9999\u6e2f|\ud14c\uc2a4\ud2b8|\ud55c\uad6d|xn\\-\\-0zwm56d|xn\\-\\-11b5bs3a9aj6g|xn\\-\\-3e0b707e|xn\\-\\-45brj9c|xn\\-\\-80akhbyknj4f|xn\\-\\-90a3ac|xn\\-\\-9t4b11yi5a|xn\\-\\-clchc0ea0b2g2a9gcd|xn\\-\\-deba0ad|xn\\-\\-fiqs8s|xn\\-\\-fiqz9s|xn\\-\\-fpcrj9c3d|xn\\-\\-fzc2c9e2c|xn\\-\\-g6w251d|xn\\-\\-gecrj9c|xn\\-\\-h2brj9c|xn\\-\\-hgbk6aj7f53bba|xn\\-\\-hlcj6aya9esc7a|xn\\-\\-j6w193g|xn\\-\\-jxalpdlp|xn\\-\\-kgbechtv|xn\\-\\-kprw13d|xn\\-\\-kpry57d|xn\\-\\-lgbbat1ad8j|xn\\-\\-mgbaam7a8h|xn\\-\\-mgbayh7gpa|xn\\-\\-mgbbh1a71e|xn\\-\\-mgbc0a9azcg|xn\\-\\-mgberp4a5d4ar|xn\\-\\-o3cw4h|xn\\-\\-ogbpf8fl|xn\\-\\-p1ai|xn\\-\\-pgbs0dh|xn\\-\\-s9brj9c|xn\\-\\-wgbh1c|xn\\-\\-wgbl6a|xn\\-\\-xkc2al3hye2a|xn\\-\\-xkc2dl3a5ee0h|xn\\-\\-yfro4i67o|xn\\-\\-ygbi2ammx|xn\\-\\-zckzah|xxx)" + "|y[et]" + "|z[amw]))"; /** * Good characters for Internationalized Resource Identifiers (IRI). * This comprises most common used Unicode characters allowed in IRI * as detailed in RFC 3987. * Specifically, those two byte Unicode characters are not included. */ public static final String GOOD_IRI_CHAR = "a-zA-Z0-9\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF"; public static final Pattern IP_ADDRESS = Pattern.compile( "((25[0-5]|2[0-4][0-9]|[0-1][0-9]{2}|[1-9][0-9]|[1-9])\\.(25[0-5]|2[0-4]" + "[0-9]|[0-1][0-9]{2}|[1-9][0-9]|[1-9]|0)\\.(25[0-5]|2[0-4][0-9]|[0-1]" + "[0-9]{2}|[1-9][0-9]|[1-9]|0)\\.(25[0-5]|2[0-4][0-9]|[0-1][0-9]{2}" + "|[1-9][0-9]|[0-9]))"); /** * RFC 1035 Section 2.3.4 limits the labels to a maximum 63 octets. */ private static final String IRI = "[" + GOOD_IRI_CHAR + "]([" + GOOD_IRI_CHAR + "\\-]{0,61}[" + GOOD_IRI_CHAR + "]){0,1}"; private static final String GOOD_GTLD_CHAR = "a-zA-Z\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF"; private static final String GTLD = "[" + GOOD_GTLD_CHAR + "]{2,63}"; private static final String HOST_NAME = "(" + IRI + "\\.)+" + GTLD; public static final Pattern DOMAIN_NAME = Pattern.compile("(" + HOST_NAME + "|" + IP_ADDRESS + ")"); /** * Regular expression pattern to match most part of RFC 3987 * Internationalized URLs, aka IRIs. Commonly used Unicode characters are * added. */ public static final Pattern WEB_URL = Pattern.compile( "((?:(http|https|Http|Https|rtsp|Rtsp):\\/\\/(?:(?:[a-zA-Z0-9\\$\\-\\_\\.\\+\\!\\*\\'\\(\\)" + "\\,\\;\\?\\&\\=]|(?:\\%[a-fA-F0-9]{2})){1,64}(?:\\:(?:[a-zA-Z0-9\\$\\-\\_" + "\\.\\+\\!\\*\\'\\(\\)\\,\\;\\?\\&\\=]|(?:\\%[a-fA-F0-9]{2})){1,25})?\\@)?)?" + "(?:" + DOMAIN_NAME + ")" + "(?:\\:\\d{1,5})?)" // plus option port number + "(\\/(?:(?:[" + GOOD_IRI_CHAR + "\\;\\/\\?\\:\\@\\&\\=\\#\\~" // plus option query params + "\\-\\.\\+\\!\\*\\'\\(\\)\\,\\_])|(?:\\%[a-fA-F0-9]{2}))*)?" + "(?:\\b|$)"); // and finally, a word boundary or end of // input. This is to stop foo.sure from // matching as foo.su public static final Pattern EMAIL_ADDRESS = Pattern.compile( "[a-zA-Z0-9\\+\\.\\_\\%\\-\\+]{1,256}" + "\\@" + "[a-zA-Z0-9][a-zA-Z0-9\\-]{0,64}" + "(" + "\\." + "[a-zA-Z0-9][a-zA-Z0-9\\-]{0,25}" + ")+" ); /** * This pattern is intended for searching for things that look like they * might be phone numbers in arbitrary text, not for validating whether * something is in fact a phone number. It will miss many things that * are legitimate phone numbers. * * <p> The pattern matches the following: * <ul> * <li>Optionally, a + sign followed immediately by one or more digits. Spaces, dots, or dashes * may follow. * <li>Optionally, sets of digits in parentheses, separated by spaces, dots, or dashes. * <li>A string starting and ending with a digit, containing digits, spaces, dots, and/or dashes. * </ul> */ public static final Pattern PHONE = Pattern.compile( // sdd = space, dot, or dash "(\\+[0-9]+[\\- \\.]*)?" // +<digits><sdd>* + "(\\([0-9]+\\)[\\- \\.]*)?" // (<digits>)<sdd>* + "([0-9][0-9\\- \\.]+[0-9])"); // <digit><digit|sdd>+<digit> /** * Convenience method to take all of the non-null matching groups in a * regex Matcher and return them as a concatenated string. * * @param matcher The Matcher object from which grouped text will * be extracted * * @return A String comprising all of the non-null matched * groups concatenated together */ public static final String concatGroups(Matcher matcher) { StringBuilder b = new StringBuilder(); final int numGroups = matcher.groupCount(); for (int i = 1; i <= numGroups; i++) { String s = matcher.group(i); if (s != null) { b.append(s); } } return b.toString(); } /** * Convenience method to return only the digits and plus signs * in the matching string. * * @param matcher The Matcher object from which digits and plus will * be extracted * * @return A String comprising all of the digits and plus in * the match */ public static final String digitsAndPlusOnly(Matcher matcher) { StringBuilder buffer = new StringBuilder(); String matchingRegion = matcher.group(); for (int i = 0, size = matchingRegion.length(); i < size; i++) { char character = matchingRegion.charAt(i); if (character == '+' || Character.isDigit(character)) { buffer.append(character); } } return buffer.toString(); } /** * Do not create this static utility class. */ private Patterns() {} }
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java
solusi, bukanandroid
Saya akan mencoba standar "Mengapa kamu melakukannya seperti ini?" jawab ... Tahukah kamu tentang
java.net.URL
?URL url = new URL(stringURL);
Di atas akan muncul
MalformedURLException
jika tidak dapat mengurai URL.sumber
Masalah dengan semua pendekatan yang disarankan: semua RegEx sedang memvalidasi
Semua kode berbasis RegEx direkayasa secara berlebihan: kode ini hanya akan menemukan URL yang valid! Sebagai contoh, ini akan mengabaikan apa pun yang dimulai dengan "http: //" dan memiliki karakter non-ASCII di dalamnya.
Bahkan lebih: Saya telah menemukan waktu pemrosesan 1-2 detik (single-threaded, dedicated) dengan paket Java RegEx (memfilter alamat Email dari teks) untuk kalimat yang sangat kecil dan sederhana, tidak ada yang spesifik; mungkin bug di Java 6 RegEx ...
Solusi termudah / tercepat adalah menggunakan StringTokenizer untuk membagi teks menjadi token, menghapus token yang dimulai dengan "http: //" dll., Dan menggabungkan token menjadi teks lagi.
Jika Anda ingin memfilter Email dari teks (karena nanti Anda akan melakukan NLP staf dll) - hapus saja semua token yang mengandung "@" di dalamnya.
Ini adalah teks sederhana di mana RegEx dari Java 6 gagal. Cobalah dalam berbagai varian Java. Dibutuhkan sekitar 1000 milidetik per panggilan RegEx, dalam aplikasi pengujian single threaded yang berjalan lama:
pattern = Pattern.compile("[A-Za-z0-9](([_\\.\\-]?[a-zA-Z0-9]+)*)@([A-Za-z0-9]+)(([\\.\\-]?[a-zA-Z0-9]+)*)\\.([A-Za-z]{2,})", Pattern.CASE_INSENSITIVE); "Avalanna is such a sweet little girl! It would b heartbreaking if cancer won. She's so precious! #BeliebersPrayForAvalanna"); "@AndySamuels31 Hahahahahahahahahhaha lol, you don't look like a girl hahahahhaahaha, you are... sexy.";
Jangan mengandalkan ekspresi reguler jika Anda hanya perlu memfilter kata dengan "@", "http: //", "ftp: //", "mailto:"; itu adalah biaya rekayasa yang besar.
Jika Anda benar-benar ingin menggunakan RegEx dengan Java, coba Automaton
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it will find only valid URLs!
- itulah tujuan pertanyaan OP. Apakah saya melewatkan sesuatu?Ini juga berfungsi:
String regex = "\\b(https?|ftp|file)://[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]";
catatan:
String regex = "<\\b(https?|ftp|file)://[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]>"; // matches <http://google.com> String regex = "<^(https?|ftp|file)://[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]>"; // does not match <http://google.com>
Jadi mungkin yang pertama lebih berguna untuk penggunaan umum.
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Sejalan dengan jawaban billjamesdev, berikut adalah pendekatan lain untuk memvalidasi URL tanpa menggunakan RegEx:
Dari lib Apache Commons Validator , lihat kelas UrlValidator . Beberapa kode contoh:
Buat UrlValidator dengan skema "http", dan "https" yang valid.
String[] schemes = {"http","https"}. UrlValidator urlValidator = new UrlValidator(schemes); if (urlValidator.isValid("ftp://foo.bar.com/")) { System.out.println("url is valid"); } else { System.out.println("url is invalid"); } prints "url is invalid"
Jika sebaliknya, konstruktor default digunakan.
UrlValidator urlValidator = new UrlValidator(); if (urlValidator.isValid("ftp://foo.bar.com/")) { System.out.println("url is valid"); } else { System.out.println("url is invalid"); }
mencetak "url valid"
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((http?|https|ftp|file)://)?((W|w){3}.)?[a-zA-Z0-9]+\.[a-zA-Z]+
periksa di sini: - https://www.freeformatter.com/java-regex-tester.html#ad-output
Ini memilah entri tesis dengan benar
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Saat menggunakan ekspresi reguler dari pustaka RegexBuddy, pastikan untuk menggunakan mode pencocokan yang sama di kode Anda sendiri sebagai regex dari pustaka. Jika Anda membuat cuplikan kode sumber di tab Gunakan, RegexBuddy akan secara otomatis menyetel opsi pencocokan yang benar di cuplikan kode sumber. Jika Anda menyalin / menempelkan regex, Anda harus melakukannya sendiri.
Dalam kasus ini, seperti yang ditunjukkan orang lain, Anda melewatkan opsi ketidakpekaan huruf besar / kecil.
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